Assessing urban development indicators for environmental sustainability

Abstract

Rapid urbanization and inadequate environmental planning have significantly increased pressure on ecosystems, leading to unsustainable urban growth. Understanding the environmental impact of urbanization is crucial for sustainable development, especially in rapidly growing cities like Mashhad, Iran. Emergy Analysis, a method that quantifies the total energy used to support an ecosystem, was applied in this study to assess Mashhad’s environmental sustainability using emergy-based indicators. Key sustainability indicators, such as the Emergy Sustainability Index, Environmental Load Ratio, and Emergy Self-Support Ratio, were analyzed using data from 2011, 2016, and 2021. The results reveal that Mashhad's development is currently unsustainable, with heavy dependence on non-renewable resources and increasing environmental pressure. While the Emergy Sustainability Index showed modest improvement, key indicators like the Emergy Yield Ratio and Emergy Density declined, indicating reduced resource efficiency. Additionally, the Environmental Load Ratio increased, reflecting higher environmental stress. Without significant interventions, Mashhad’s current development trajectory will remain unsustainable. The study offers practical recommendations, such as reducing urban sprawl, promoting green spaces, and transitioning to renewable energy sources. Educating residents about resource efficiency and sustainable urban planning is critical. These findings provide actionable insights for other developing cities facing similar environmental challenges and serve as a blueprint for sustainable urban development in resource-constrained settings.