A deadly heatwave in West Africa and the Sahel was &;quot;impossible&;quot; without human-induced climate change‚ scientists say. Temperatures soared above 48C in Mali last month with one hospital linking hundreds of deaths to the extreme heat. Researchers say human activities like burning fossil fuels made temperatures up to 1.4C hotter than normal. A separate study on drought in Southern Africa said El Ni&;ntilde;o was to blame‚ rather than climate change. A number of countries in the Sahel region...