Fossil fuels may release plenty of carbon dioxide, but they alone aren’t responsible for all of the greenhouse gases blamed for global climate change. What causes bubbling brooks to bubble is actually methane, according to researchers at the University of Wisconsin, and the same is true for the belching of cattle. The U.S. Environmental Protection Agency says methane has a 20 percent larger impact on the environment than CO2 does. But rice? This grain is so important to human nutrition that it is second only to corn in its volume of production.…

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