NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY
Rotating globe showing the carbon emissions from the largest cities. Cities and their associated power plants are the largest sources of greenhouse gas emissions from human activity. At least 70% of fossil fuel carbon dioxide (CO2) emissions, and a significant amount of methane, is from the small fraction of the Earth's land surface covered by cities.
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