Climate change is already impacting the world’s staple food crops, sending prices up and outputs down. According to the UN Food and Agriculture Organization, the global price of cereals, the world’s staple crops, has more than doubled since 2000. Why? Stresses on global water supplies, something that climate change will continue to exacerbate. Climate change’s affect on agriculture will be its most important impact on our economy. Yields of major US crops will decline, as will profits from US farms, with increased uncertainty about crop yields. Just 2 degrees of warming – expected by 2030 – will decrease US production of the global food staples wheat, rice, and maize.