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Over 1% of the world's total GHG footprint could be saved by simple improvements to the way rice is usually grown. This is a big untold story. It has nothing to do with the fossil fuel used by tractors, lorries, boats or any other parts of the supply chain. Specifically, what is needed is more judicious use of fertiliser and not flooding paddy fields22. Paddy field methane is about 6% of all greenhouse gas emissions from the food supply chain. I've seen photos of rivers in China that are bright green from so much excess fertiliser; the yield is probably actually suffering from over application.