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Rice feeds more people than any other crop, and it is grown in a way that is quietly expensive. Globally, a third of all groundwater extraction goes to rice farming. And because those fields sit flooded for weeks at a time, the resulting anaerobic conditions produce methane. Rice accounts for around 2% of global greenhouse gas emissions, comparable to the aviation industry, and about 12% of all methane. In India, rice covers some 40 million hectares, a quarter of the country's agricultural la...
