By Emmanuelle Landais SIKILO, Senegal (Thomson Reuters Foundation) - Walking through his dry millet field, Alioune Djaby, chief of Sikilo village, waits for a sign that rainfall is coming. "The overall amount of rainfall has decreased in the past decades, as the rainy season starts later and lasts for a shorter amount of time," said Ousmane Ndiaye, a meteorologist and researcher at the national meteorological agency. In 2015 for example, the monsoon was expected in mid-May in southern Senegal but started three months late, in August.

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