"Climate change is already having sweeping effects on every continent and throughout the world's oceans, scientists report...and they warned that the problem was likely to grow substantially worse unless greenhouse emissions are brought under control. The report by the Intergovernmental Panel on Climate Change, a United Nations group that periodically summarizes climate science, concluded that ice caps are melting, sea ice in the Arctic is collapsing, water supplies are coming under stress, heat waves and heavy rains are intensifying, coral reefs are dying, and fish and many other creatures...