RACHAEL GROSS and ROB HEINSOHN AFRICAN elephant numbers have dropped from about 26 million in the 1800s to 415,000 today. While this is largely due to European colonisation, poaching and habitat loss, these majestic animals now face another grave challenge. Climate change is causing droughts in much of Africa to become longer and more severe. This damages elephant habitats and denies them the water they need. Due to their unique physiology, African elephants need hundreds of litres of water each day to survive. The African savanna elephant is listed as endangered. If the situation doesn’t change, Africa – indeed, the…