Here are some links to get you started in your research about reducing the impacts of Agriculture. There are industry and individual links. Your group should use 2-3 resources of your own as well. Be sure to add the links that you use to your references page, even if they come from below.
Industry
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http://wwf.panda.org/what_we_do/footprint/agriculture/impacts/soil_erosion/
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http://study.com/academy/lesson/soil-erosion-effects-prevention.html
Individuals