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Related Experiment Videos

Megacities and the environment.

Ethan H Decker1, Scott Elliott, Felisa A Smith

  • 1Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA. ehdecker@unm.edu

Thescientificworldjournal
|June 14, 2003
PubMed
Summary
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Megacities significantly impact the environment despite low population percentages. Their resource consumption, particularly fuels, creates global waste impacts, suggesting urban development is a global, not final, stage.

Area of Science:

  • Environmental Science
  • Urban Ecology
  • Biogeochemistry

Background:

  • Megacities, representing 4% of the global population, exert disproportionate environmental influence.
  • Understanding the biogeochemistry of these large urban areas is crucial for assessing global environmental change.

Purpose of the Study:

  • To review the biogeochemistry of the world's 25 largest cities.
  • To examine resource flows (water, fuels, materials, food) and their environmental impacts.
  • To introduce 'urban metabolism' and 'urban succession' as frameworks for studying urban systems.

Main Methods:

  • Review of existing climatic, demographic, and economic data for megacities.
  • Analysis of available data on resource flows and waste streams.
  • Exploration of megacity impacts on geologic, hydrologic, atmospheric, and ecological processes.

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Main Results:

  • No clear demographic or economic patterns exist across megacities, except wealthier cities show slower growth.
  • Water is not retained, construction materials and food dominate infrastructure and waste, and fuels create global chemical wastes.
  • Megacity resource consumption affects environmental processes at local, regional, and global scales.

Conclusions:

  • Megacities are dynamic systems, not static endpoints of urban evolution.
  • The concepts of urban metabolism and urban succession provide valuable frameworks for future research.
  • The ultimate stage of urban development is a global steady state between human society and resource availability.