SUMMARY: New research from NASA shows that cities in the United States have been built on the most fertile soils of the nation - cities account for just 3% of its land area, but food grown there could out produce the 29% of the US which is currently used for agriculture. The researchers used data two NASA satellites to track plant growth and the locations of urban centres. They created a computer model for a potential pre-urban US landscape which they used to calculate how much the country's vegetation growth is diminished because of cities.

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