Associated Press: West Africa is already living on the edge, and new research indicates that worse droughts are possible than the one that devastated the region in the late 20th century. As many as 100,000 people died in the multi-decade Sahel drought that began in the 1960s, and a detailed look at lake sediments in Ghana indicates that such dry periods have occurred periodically, punctuated by occasional century-long droughts. Changing climate could cause more such disastrous droughts, …