Global Change
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It refers to large-scale changes in Earth's biological, geological, hydrological, and atmospheric systems. Agriculture is vulnerable to these environmental changes. Successfully adapting to change depends upon a quantitative and predictive understanding of the ways that agriculture and food supplies may be affected by climate change, rising atmospheric carbon dioxide and ozone levels, and increased UV-B radiation
The link address is: http://www.ars.usda.gov/research/programs/programs.htm?NP_CODE=204
