In A field just outside the village of Bum-wambu in eastern Uganda, surrounded by banana trees and cassava, with chickens running between the mud-brick houses, Frederick Makawa is thinking about tomatoes. It is late June and the rainy season is coming to an end. Tomatoes are a valuable cash crop during the coming dry season and Mr Makawa wants to plant his seedlings as soon as possible. But Uganda's traditional growing seasons are shifting, so he is worried about droughts or flash floods that could destroy his crop.
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