Sustainable urban growth patterns based on environmental fitness

Abstract

This study examines the sustainability of urban growth, described by patterns of environmental fitness. The main assumption is that resource use—energy, materials, electricity, water, fossil fuels, soil, and humans—describes growth patterns whose sustainability can be categorized according to environmental fitness, which is assessed by the availability of environmental resources (characteristics of the environment) and the adaptation of the city to this availability (characteristics of the built environment). The article offers an innovative perspective by proposing a model for categorizing the sustainability of urban growth based on environmental fitness, but also by providing a mean to understand the city as a process and the city as a satisfier of needs. The methodology comprises two parts: (1) creating a matrix of indicators of urban environmental fitness and (2) constructing an urban growth sustainability index. From this methodology, six patterns emerged: (i) Economizing growth: available resources with maximum urban adaptation; (ii) Weak growth: availability of resources with minimal urban adaptation; (iii) Efficient growth: availability of resources with appropriate urban adaptation; (iv) Deficient growth: availability of resources without urban adaptation; (v) Efficient growth and of investment: lack of resources with urban investment; and (vi) Deficient growth and of degradation: lack of resources with urban deterioration and wear. The finding of these sustainable urban growth patterns demonstrates the concrete application of environmental adaptation theories and an understanding of the global behavior of cities. The empirical results support the assertion that urban growth presents challenges and potentials in terms of reduction, of reuse, and recycling; of urban sprawl, urban renewal, redevelopment and infill growth, and the efficiency and maintenance of urban infrastructure as guidelines for urban sustainability.

1 Introduction

Urban growth can be described by the patterns, processes, and dynamics of how cities expand, densify, transform, and reconfigure over time as the consequence of changes and evolutions in human needs and the consequent demand for and supply of resources. The capacity of cities to meet these needs depends on both the availability of environmental resources and the efficiency and sufficiency of urban infrastructure to provide access to them. Given that all human activity influences the environment due to both resource consumption and waste generation, it’s useful to understand cities as open, dynamic systems where input and output flows of matter and energy might be in balance to allow their operation and continuity without damaging the system—the environment and the built environment. This approach to the city from a systems perspective is used to discuss the concept of sustainability anchored in the interaction of a population and the carrying capacity of its environment, which can be regarded as a system state that is mediated by specific structures (Ben-Eli, 2018). The research focus is on the sustainability of urban growth based on the description of patterns of environmental fitness.

In this study, urban growth will be described in dimensions of space, form, and time.

1.1 Urban growth spatial patterns (two dimensions).

Urban growth spatial patterns refer to the ways in which cities and urban areas expand and develop over time, as well as the spatial distribution of different land uses within urban areas. They are influenced by a variety of internal and external factors, and several types have been defined in the literature, which reflect how urbanization is affected by the physical geography, economic, social, and natural factors of individual cities. These patterns are characterized by both the continuity of growth and the starting point of growth. Shi et al. (2012) developed spatial rules to identify three types of urban growth (infilling, edge sprawl, and peripheral) in peri-urban areas of Lianyungang City, China, noting that the predominant type of urban growth was edge sprawl. Mou et al. (2018) explain that, in general, urban growth involves three different spatial patterns: edge expansion, outlying, and infilling. Edge expansion refers to the phenomenon of homocentric outspread, indicating a spatially subsequent expansion and extension of urban built-up areas. Outlying is characterized by the new urban lands occurring beyond developed areas. Infilling is introduced as developing the vacant land between established patches. Subasinghe (2019) explored urban growth patterns based on urban land classification and detected three main types of urban growth: infill, sprawl, and leapfrog. However, he noted that only recognizing three types of urban growth patterns may be insufficient due to the complexity of urban growth. Qian et al. (2019) investigated green space patterns in urban areas defined by three growth types: edge expansion, peripheral, and infill, finding significant differences in green space patterns among different urban growth types. And the combination, discontinuity, or change of them over time is common; for instance, the urban growth in Chennai was shown to exhibit a high level of sprawl in peri-urban regions while maintaining a tendency to form a single patch of clumped and simple-shaped growth at the core (Aithal and Ramachandra, 2016). On this basis, and in summary, spatial patterns and their characteristics are presented in Table 1.

1.2 Urban form growth patterns (three dimensions)

Urban form considers physical and non-physical structures, the functionality, livability, social dynamics, and dimension of the built environment expansion shaped by historical, cultural, economic, geographic, planning, and political factors, among other factors. Describe aspects/characteristics of a city, such as the size and configuration of an urban area or its parts. It refers to how a city is understood, structured, or analyzed according to scale (Živković, 2020). Urban form is the result of human self-organization that follows diverse logics over time and is described qualitatively, quantitatively, or spatially at different scales and, in many cases, through isolated one-dimensional measurements. Urban form indicators provide valuable insights into the physical layout, structure, and spatial characteristics of urban growth. Density, land use mix, street network connectivity, building density, and green space availability, among others. Rather than referring to differences in population density or development, it is common to examine development patterns on the landscape when modeling urban growth; landscape metrics began to be used to analyze urban land use patterns, demonstrating significant changes in metropolitan areas, especially in more recently developed areas like certain Spanish metropolitan areas (Aguilera et al., 2011). Studies started to focus on the visualization of urban growth using geoinformatics and spatial metrics, for instance, the urban growth in Chennai was shown to exhibit a high level of sprawl in peri-urban regions while maintaining a tendency to form a single patch of clumped and simple-shaped growth at the core (Aithal and Ramachandra, 2016). In global datasets to characterize urban growth in both two- and three-dimensional forms across major cities worldwide, a variety of urban growth typologies were identified, such as outward, mature upward, budding outward, and combinations theories (Mahtta et al., 2019). Figure 1 shows a schematization of the scales for studying and understanding the city and its dimensions.

Figure 1

1.3 Temporal patterns (four dimensions)

Urban growth over time involves change and evolves across different time periods, stages of development, phases of growth, and historical events that shape the city’s evolution and encompass long-term trends, short-term fluctuations, and cyclical patterns of urban change. The rate of growth indicates the rate at which the city changes over a given period; it may be constant, variable, or dependent on a variety of factors. Fenta et al. (2017) assessed the dynamics and spatial pattern of urban sprawl in Mekelle City, Ethiopia, using multitemporal Landsat imagery and found that the predominant urban sprawl was the extension of existing urban areas.

Different spatial or urban form growth patterns can vary in speed rate and explain different phenomena. Bagan and Yamagata (2012) investigated the dynamics of urban growth in Tokyo, Japan, combining Landsat imagery and census data, showing rapid urban expansion accompanied by a decrease in population density in the city center. The rate of growth provides critical information about the pace, extent, and way urban areas are expanding. By projecting growth rates, decisions can be made about where to allocate resources for essential services, determine appropriate land use patterns, and guide efforts to balance development with environmental protection and preservation. In Beijing’s rapid urban expansion process, significant urban growth has been observed on the fringe, especially in low-density gated communities and industrial development. As a result, the need for long-distance travel to external areas and the use of private vehicles on the city fringe have increased (Mou et al., 2018). Urban growth rates also reflect economic vitality and investment attractiveness, employment opportunities, and impacts on housing demand and values; assess infrastructure and service capacity; and support efforts to improve urban resilience by identifying vulnerabilities and planning for future challenges, such as climate change impacts.

1.4 Environmental fitness

Environmental fitness refers to the ability of an organism to survive and reproduce in a specific environment and, at the same time, the capacity of an ecosystem or environment to support and sustain diverse forms of life. In the context of this research, “environmental fitness” refers to the ability of an urban environment to maintain its ecological balance and provide a suitable place for human life in terms of health and wellbeing. Henderson’s book, “The fitness of the environment,” states that a fit environment can be defined as one in which the greatest consumer needs are met by the same environment, which means that the organism has less adaptive work to do. “The fitness of the environment” is one part of a reciprocal relationship, the fitness of the organism being the other. And the fitness of the environment is the result of characteristics which constitute a series of maxima so numerous, so varied, and so nearly complete among all the things involved in the problem that together they certainly form the greatest possible fitness (The University of Chicago Press, 2016). This relationship between the environment and the organism that inhabits it was studied by McHarg. In “Design with Nature,” Ian L. McHarg developed an ecological planning theory and method for analyzing and evaluating biophysical and sociocultural landscape characteristics to determine appropriate land uses. His suitability analysis method links planning and design to ecology and evolutionary biology with concepts such as energy, order and disorder, adaptation, health, creativity, and human agency, as well as his parallel constructs: syntropic fitness-health and entropic mismatches-morbidity and death (Bryant and Turner, 2019). Yang and Li (2019) conclude that McHarg is a forerunner in landscape performance evaluation. Through blending project goals and performance goals, McHarg’s method improves project performance and increases the validity of ecological planning (Figure 2). “Environmental fitness” is a systemic relationship between the environment and the city that could be valued through (a) the availability of environmental resources (characteristics of the environment) and (b) the adaptation of the city to this availability (characteristics of the built environment).

Figure 2

Figure 3

Two cities (A and B) have the same level of adaptation to the environment, but different ranges of environmental fitness. Therefore, the investment of the cities to achieve their maximum level of adaptation to the environment will be different.

Two cities (B and C) have the same range of environmental fitness but different levels of adaptation to the environment. Therefore, the investment of the cities to achieve their maximum level of adaptation to the environment will also be different.

Two cities (A and C) have different levels of adaptation to the environment and different ranges of environmental fitness. But in this case, the investment of the cities to achieve their maximum level of adaptation to the environment would be the same.

Cities A, B, and C have the same system improvement limit, so the dimension of what cannot be changed is the same.

A city is a manifestation of the actions of human beings in the artificial environment controlled by the measure of individual and social human needs. Batty and Marshall (2009) assert that cities are not a place or a space, or structures in space, but a set of networks where locations naturally emerge—the nodes in a network of complex relationships—and this explains why cities are understood as places that emerge out of a relational process that arises from the interaction of flows. Therefore, cities are regulated by interactions, feedback, and fitness between nature and human society, culture, economics, technology, and politics, all of which create an environment that can influence and be influenced by both ecological and evolutionary processes (Des Roches et al., 2021). Based on this interpretation, the space-form-time properties of complex systems, particularly those of a city, arise spontaneously from interactions between the elements that make it up and on time scales considerably larger than the scales on which the said interactions occur. Although the study of urban interactions is mainly conducted based on the interactions of geographical elements or spatial relations, in the context of globalization and production fragmentation, other flows, such as information flows, have explicit geographical meaning (Li and Duan, 2020).

The city can be described as a complex adaptive system, with interconnected and interacting elements that can learn, adapt, and self-organize, evolving based on feedback and interactions with each other and their environment. Cities, as complex systems, are characterized by a variety of interrelated elements and relationships between them that are not always apparent (Opromolla and Volpi, 2020). Systems have inputs of information or resources from the external environment, process or transform these inputs, and then generate results or outputs that are sent back to the environment. A closed-loop system is a type of system in which the output or result of the process is used to influence the input of the same system, creating a feedback loop. In this type of system, information about the output is compared to a reference or desired value, and any difference between the actual output and the reference is used to adjust and control the input. The concept of a closed-loop system is primarily used in control theory and engineering to describe a type of control mechanism.

According to Moore and Hague (2019), characteristics of systems are: (a) they have a purpose that defines them as a discrete entity and that provides the integrity that holds them together, the purpose is a property of the system as a whole and not of any of the parts; (b) the order in which the parts are arranged affects the performance of a system, if the components of a collection can be combined in any random order, then they do not form a system; and (c) systems attempt to maintain stability through feedback, which is the sending and returning of information that lets the system know how it is doing relative to some desired state. Sustainable development is a development model that highlights the relationship between man and nature that enables actual societies to satisfy their current and future needs, maintain their quality of life, and preserve and restore natural resources (Schipper and Meyers, 1992). It involves balancing economic, social, and environmental dimensions to ensure long-term wellbeing. From a system perspective, sustainability can be understood as the search for, construction of, or regeneration of circular and closed-loop systems that can make their own decisions and adapt automatically based on the feedback they receive.

Environmental fitness is proposed as a systemic approach of sustainability in urban growth patterns that explores ways to develop closed-loop urban systems. The methodology comprises two parts: (1) creating a matrix of indicators of urban environmental fitness and (2) constructing an urban growth sustainability index.

2 Methodology

The methodology for defining urban growth sustainability patterns based on environmental fitness comprises two parts: (1) creating a matrix of urban environmental fitness and (2) constructing an index for urban growth sustainability.

2.1 Part 1: matrix of urban environmental fitness

The matrix is a set of indicators organized in a structure that represents the city as a closed-loop system. Based on the concept of fitness, resources were analyzed as flows with inputs, outputs, and recovery of resources (energy, materials, electricity, water, fossil fuels, minerals, biomass, and soil), as well as their influence on critical attributes (urban footprint, governance, social patterns, urban work, sustainability, waste, and transport; Table 2).

This arrangement provides a summary of information about the behaviors of the city in the aspects analyzed, as well as its structure. This could be useful for comparing it with another matrix of the same city at a different time or with another city within the same timeframe. It could help identify those indicators that are not available in direct sources but can be obtained from the geographical analysis on different scales, as well as those that can be represented geographically by sectors or districts rather than the type of data aggregation. Furthermore, the matrix arrangement facilitated the identification of critical attributes of a resource or a critical aspect within a resource flow, which in turn proved useful in defining areas for improvement in the management of resources and infrastructure. Indicators in vectors permit the analysis of a city as both a process and a satisfier.

When reading horizontally, inputs and outputs of matter and energy will be defined, as well as the matter and energy through different urban processes (the city as a process). Ideally, in a fully environmentally fit city, outflows or waste would be returned as inflows. These indicators are represented in the last column of the matrix (Table 3).

When reading vertically, the city is understood as a satisfier insofar as its purpose is to ensure the features of urban structures and services (the city as a satisfier). Ideally, in a fully efficient city, resources would be allocated to provide its inhabitants with a high standard of living. These indicators can be found in the last row of the matrix (Table 4).

The selection of indicators was based on three criteria: firstly, a comprehensive and accurate assessment of relevant environmental, economic, and social factors; secondly, the consideration of temporal and spatial horizons; and thirdly, the availability of pertinent information.

The usefulness of these indicators is enhanced by their capacity to monitor and assess the state of the environment by considering a manageable number of variables or characteristics.

Their utility is further enhanced by their ability to identify relative changes in the availability of environmental resources and the adaptation of the city to the state of the environment, which can inform decision-making and drive action. For this reason, a set of indicators was organized and structured into indicator subsets that correspond to information from subsystems, as well as input and output types for each of the environmental, economic, and social resources. From this organization, particular analysis was carried out for every city, subsystem, time, space, and type of resource to generate efficiency scores for each type of characterized urban growth pattern (Table 5).

The description, units, and sources of the selected indicators are shown in Table 6.

2.2 Part 2: urban growth sustainability index

The same indicators from another capital city in Mexico were used as comparison criteria against which each indicator was measured. This could be considered the relative sustainability of the cities under study in their respective contexts (Figure 4).

Figure 4

The matrices were developed by aggregating data on indicators from five-yearly time periods, thereby portraying the evolution of the cities under investigation from 1985 onwards. Furthermore, matrices with extreme values (maximum and minimum) of the same indicators in the same years were generated for Mexican capitals. These serve as comparison values for the study cities, providing insight into the relative performance of each (Figure 5).

Figure 5

Figure 6

2.3 Urban growth index

2.4 Characterization of sustainable urban growth patterns

Figure 7

2.5 Evaluation of the sustainable development

Once the efficiency score values for each resource have been calculated, these values are applied to the indicators to obtain a qualitative and descriptive classification of the urban growth pattern in terms of sustainability. While this characterization allows for a relative classification of growth, it does not determine its sustainability. However, when used in conjunction with the matrix of indicators by time periods - which describes the city’s growth in two, three and four dimensions - it allows us to define whether it is a scenario close to or far from of fitness, based on both resource management and adaptation to the environment.

It can be described as the maintenance of the oldest urban areas in a state of good repair, the development of intermediate urban areas in an economically efficient and appropriate manner, and minimal growth in new urban areas while conserving material and energy resources. Conversely, an unsustainable city does not maintain adequate conditions in its oldest urban areas, lacks adequate development, and fails to adapt to its intermediate urban areas. Additionally, it wastes resources on new areas of urban development with expansion and periphery (Figure 8).

Figure 8

The combination of the six growth patterns (6⁶) results in a total of 4,665,600 potential combinations. From these, we can identify a combination that could come close to the definition of resilient urban growth, which encompasses the maintenance of urban infrastructure, policies, and systems that can withstand adverse shocks, minimize the vulnerability of people and communities, and facilitate rapid recovery from disruptive events. And on the contrary, fragile or non-resilient urban growth, with urban areas that are unprepared to face the challenges and disturbances that may arise, with inadequate infrastructure, a lack of urban planning, vulnerability to adverse events, dependence on a single economic sector, lack of community participation, and a lack of adaptation to the environment with high urban sprawl and peripheral growth in an environment with few resources (Figure 9).

Figure 9

A comparative study of the growth of three Mexican cities can be used to illustrate and analyze the characteristics of urban growth in two, three, and four dimensions.

3 City selection

In Mexico, the Valley of Mexico, or central region of the country, is the most densely populated in Mexico, with an estimated population of 21 million inhabitants in 2020, according to the National Institute of Statistics and Geography (INEGI), and it concentrates a higher level of economic activity, infrastructure, and services than any other metropolitan area in the country. This is related to the regional integration of cities in a network that connects different states and municipalities functionally, spatially, and in terms of connectivity. Some cities in this region are in a conurbation—physical continuity—and, in some cases, form metropolitan areas by occupying more than one administrative and political unit. Metropolitan areas and contiguous cities form a metropolitan zone, which is formed by all adjacent full municipalities in which they are located. The cities included in this study were selected based on their proximity and relationship to the expansion of Mexico City, their growth history and projections, and the similarity and comparability of their socioeconomic profiles. Toluca, Cuernavaca, and Pachuca are the three cities closest to Mexico City (Figure 10). They are located along its urban development axis and are therefore likely to become part of its metropolitan area; they are all state capitals, comparable in their characteristics and similar in their functional relationships with Mexico City, receiving large amounts of waste generated there and providing it with environmental services.

Figure 10

Mexico City is forcing major changes on the surrounding rural and urban centers, generating growth and development in the region. The land around small towns is transformed as it is taken over by industries located outside the city. The natural environment of the region’s sparsely populated areas becomes housing and recreational space for an increasing number of urban dwellers, and traditional land uses change without control or adequate planning. The growth of Mexico City indirectly promotes the urbanization of these areas that have provided environmental services to Mexico City. The municipalities of Cuernavaca, Toluca, and Pachuca are located outside the Mexico City metropolitan area, have a predominantly urban character, and maintain a strong level of functional relationships with Mexico City, such as having a significant number of residents who commute to their jobs in the central municipalities of the Mexico City metropolitan area. The cities analyzed in this study are considered metropolitan areas, a term that in this case means the set of two or more municipalities in which there is a city of more than 50,000 inhabitants with an urban area, functions, and activities that extend beyond the limits of the municipality in which the city was originally located, and that includes predominantly urban neighboring municipalities or has a direct influence on them, as well as a high degree of socioeconomic integration with them. Over the last 30 years, urban sprawl has created a discontinuous, dispersed, and low-density model for Mexican cities. The objective of the identification and delineation of metropolitan zones is to create a common and comparable statistical geography.

4 Results

Tables 7, 8 show the results of the application of the methodology in the form of a diagram. Historical–geographical, per subsystem, per type or resource, per type of inputs and outputs (or growth pattern), from 1995 to 2000 in periods of 5 years (Figure 11).

Figure 11

Table 7

Sustainable urban growth patterns based on environmental fitness
	Pachuca	Toluca	Cuernavaca
	The orientation of Pachuca’s growth is to the Southwest (to Mexico City), South, and West. It does not grow to the north and northeast in the mountains.	The orientation of Toluca’s growth is both to the East and Northeast (to Mexico City).	Cuernavaca’s growth to the East and South, where there were rain-fed and irrigation fields or secondary vegetation. In the other orientations, it does not grow due to the mountains and topography.
Two dimensions
	Three dimensions
Fourth dimensions

Growth axis of Cuernavaca, Toluca, and Pachuca.

5 Discussion of results

The results show large variations between the patterns of growth and sustainability characteristics of these types of growth, both by resource type for the efficient use of resources and in the Calidad of life and periods. Overall, growth rates do not reflect a development oriented toward sustainability. The growth factors respond to human needs and resource availability. Programs, plans, and strategies for urban sustainability have not yet been reflected in reality. Any effort directed to this effect shall seek equity, livability, and viability for the city. And the feasibility, necessity, and effectiveness of these strategies should be evaluated.

For the city of Toluca, in the period 1995–2000, the city presents 13 indicators of Deficient Growth and Degradation, 3 indicators of Deficient Growth Not Adapted to the Environment, and 2 indicators of Weak Growth. This makes a total of 22 indicators (43%) of unsustainable growth. Moreover, it features six growth indicators for efficient investment. For 2000–2005, the city rose to 17 indicators of Deficient Growth and Degradation, 5 indicators of Deficient Growth Not Adapted to the Environment, and 1 indicator of Weak Growth, which makes a total of 23 indicators (56%) of unsustainable growth. On the other hand, the number of efficient growth indicators increased to 7. This involves partial improvement in some ways, but we can say that growth remains similar to the previous period. For the period 2005–2010, the city presents 20 indicators of Deficient Growth and Degradation, 6 indicators of Deficient Growth Not Adapted to the Environment, and 4 indicators of Weak Growth, which makes a total of 30 indicators (73%) of no growth sustainable. It also presents the positive side: 12 indicators of efficient growth and investment. This city is noted for growth that has remained unsustainable for three periods.

In general terms, it is identified that the growth sustainability patterns of the cities of Pachuca and Toluca present weak growth; the urban structure remains essentially unaltered and is poorly adapted to the environment. In unfavorable environments with limited resources or significant external pressures. While Cuernavaca goes from weak to deficient growth not adapted to the environment with a decline in the condition of structures and urban infrastructure resulting from a combination of deterioration and inadequate maintenance in a favorable environmental context, to finally, toward an economizing growth in which urban structure remains largely unchanged in a favorable environment.

6 Reflections on the approach and limitations of the study

The main limitation of the analysis is the need for local indicators to be periodically updated to perform a long-term study. The construction of a generic urban environmental fitness matrix can be adapted to the availability of information for the construction of indicators that can provide temporal continuity. In Mexico, the availability and consistency of data are limited. This research uses indicators from different administrative levels. Since indicators are scaled by the corresponding area, population, or GDP, their use should not significantly decrease the degree to which they are comparable. Therefore, metropolitan areas can have noticeable variations from one city to another. To try and overcome data gaps, strong theoretical techniques should be considered when calculating estimates. Moreover, the potential effects of factors such as “access to water” or “access to sanitation.” should also be considered. While informal settlements vary in size and definition, they generally lack data on infrastructure, access to public services, and population. Due to this, it is necessary to use digital maps to analyze real references that are not formally registered. The indicator collection in this study also includes those that are commonly used as references, which include reviews from the National Institute of Geography and Informatics and the Secretariat of Environment.

Current indicators provide valuable information about the material and energy balance in various areas. This information is available and generated by local governments, and it plays a crucial role in designing policies and programs related to energy efficiency, the use of resources, and human welfare. The information available in Mexico helps researchers to collect data on total energy, water, electricity, and general human welfare. Regarding the level of analysis, the current local information allows researchers to ascertain the performance on the three scales of analysis—city, surface, and per capita—as well as the level of outputs and recycling of energy and matter. The proposed indicators are mostly related to the geographic information system that was generated to measure changes in local land use and are related to the dimensions of soil and biomass. Similarly, the other group of proposed indicators is related to the analysis of programs aimed at material, energy, and clean efficiency in government sectors, and they indicate a better environmental performance of cities at the local level, as well as the increasing level of clean, recycled, or reused materials and energy. In the case of indicators taken from other sources, it is important to note that these indicators already exist and are measured in other countries or at scales different from the local ones. Similarly, it is important to generate information that does not exist in Mexico to ensure that we have indicators that provide a complete knowledge of the uses and applications of the material and energy balance of a city.

Productive activities use environmental resources, thus transforming them into goods and services with market values to obtain benefits and externalize costs to society. The resources and services provided by the environment, such as intermediate inputs, such as capital, energy, and human labor, transform into goods on the one hand and into damages to society on the other, thus generating residual emissions with different degrading properties and toxicity to the environment and human health. The statistics on how natural resources and environmental services are transformed through human activities into goods and necessities for society can be handy warning indicators of environmental change and the misuse of raw materials as well as resources provided by natural ecosystems. The interrelation of productive processes with natural and environmental resources, as well as their socioeconomic importance, are related to environmental impacts and degradation, risks, and the running down of natural resources: agriculture and livestock, manufacturing industry, transport, energy, tourism, and residues. There are statistics regarding cities’ tendencies toward the management and disposal of solid municipal residue and representative data as to the production and installed capacity for treating and confining dangerous industrial residues, as well as a reference to the characteristics of the rubbish produced in cities, which include homemade rubbish and that coming from other sources (commercial, institutional, construction, demolition, etc.).

As an alternative, it is identified to use as benchmark world indicators such as the Human Development Index (HDI), which measures human development based on indicators such as life expectancy at birth, access to education, and per capita income level; the Ecological Footprint; the Environmental Sustainability Index (ESI); the Sustainable Development Index (SDI); sustainable building certifications or urban sustainability indicators from organizations such as the World Bank, the Organization for Economic Cooperation and Development (OECD), and the United Nations Human Settlements Programme (UN-Habitat).

7 Conclusion

Fitness underpins some theories of urban sustainability that try to transform the city from an open to a closed and environmentally adapted system during its design, operation, and/or regeneration. Transforming an open system into a closed system involves introducing elements of control and feedback to make the system self-regulating.

Environmental fitness is proposed as a systemic approach of sustainability urban growth patterns that explores ways to develop closed-loop urban systems with multiple indicators organized by subsystems and in two, three, and four dimensions.

Some applications of the urban environmental fitness matrix are: in planning and design, the restoration of ecological systems and degraded lands will require the design of standards and implementation of best practice requirements to anticipate problems and improve the benefits of environmental regulation efforts, from legal obligations and prohibitions directed at a variety of public and private actors as well as obligations; in new urban business models, innovative business models for companies that hold a significant part of the market and that have the capacity to activate the horizontal phases of the vectors and expand geographically. In the design of public policies for urban reverse cycles, the use of materials in several cycles and the final return of the materials to the soil or to the industrial production system means the logistics of the supply chain, selection, storage, risk management, or energy generation, with optimal collection and lower costs in systems of treatment.

The six sustainable urban growth patterns that emerged have potential for describing urban growth sustainability patterns and have significant practical applications in urban planning, urban renovation, strategies of urban circularity, sustainable development management, and mitigation of urban sprawl. These patterns can also aid in understanding the dynamics of urbanization, simulating population decentralization, modeling informal urbanization, and predicting urban growth by integrating socioeconomic factors.

Urban growth presents both challenges and opportunities for cities in terms of providing urban land, reducing environmental impacts, and improving the efficiency of infrastructure networks.

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