The future of Earth looks bleak, but we have the capacity to change courseShutterstock/Liu zishanThe Decline and Fall of the Human EmpireHenry Gee Pan Macmillan (UK: Available now US: 18 March)Were doomed, says Henry Gee, doomed! Homo sapiens is reaching a crest, after which our global population size will start to drop. In his new book, The Decline and Fall of the Human Empire: Why our species is on the edge of extinction, Gees mission is to trace the path from our genesis to our peak, then on to our quite possible annihilation.When H. sapiens