FERN: By now there has been a steady stream of news about climate changes impacts on food production. Heat waves, drought, and wildfire are damaging harvests in California, Australia and Brazil. Warming and acidifying oceans threaten seafood stocks. Rising temperatures are causing declines in crops as different as wheat and cherries, while extreme precipitation and floods have destroyed crops across the US and Europe. Increasing temperatures and CO2 levels are reducing the nutritional value of grasses...