Humanity is changing Earth’s climate so fast and devouring resources so voraciously that it is poised to bequeath a ravaged planet to future generations [ark] — so finds the fourth Global Environment Outlook (GEO-4). The report is published by the United Nations Environment Programme (UNEP) and was compiled by 390 experts using two decades of data. At over six billion, the human population is now so big that “the amount of resources needed to sustain it exceeds what is available”. Regional predictions are equally grim [ark]. Another report this week published in the Proceedings of the Royal Society predicts that in coming centuries rising temperatures could wipe out more than half of the earth’s species [ark].