Rice with fish – a good combination. Not only on the plate: In Qingtian, Zhejiang Province, a farmer releases a fish into the flooded rice field. There, it can grow and eat pests along the way, while the rice plants provide it with cooling shade. And the land is used twice. In China, such co-cultures have existed for about 1,300 years. The method is apparently also good for the climate: Up to 17 percent of the world’s methane emissions are produced by rice cultivation. Fish could reduce these emissions by eating plankton that grows in the fields.