Rising global temperatures may have a far bigger impact on food production than previously thought according to a study of how farmers in Brazil have actually reacted to a warmer climate over the past decade.In addition to the direct effects on harvests, scientists have discovered that warmer temperatures change the behaviour of farmers so they end up planting fewer crops than they otherwise would under normal growing conditions.This change in farming practice triggered by warmer temperatures can actually be significantly more important in lowering overall crop yields than the more direct influence of hotter or drier weather on growing conditions, the researchers found. 

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