The time to act is now.

Today we live in a time of great crisis, confronted by the gravest challenge that humanity has ever faced: the ecological consequences of our own collective karma. The scientific consensus is overwhelming: human activity is triggering environmental breakdown on a planetary scale. Global warming, in particular, is happening much faster than previously predicted, most obviously at the North Pole. For hundreds of thousands of years, the Arctic Ocean has been covered by an area of sea-ice as large as Australia—but now this is melting rapidly. In 2007 the Intergovernmental Panel on Climate Change (IPCC) forecast that the Arctic might be free of summer sea ice by 2100. It is now apparent that this could occur within a decade or two. Greenland’s vast ice-sheet is also melting more quickly than expected. The rise in sea-level this century will be at least one meter—enough to flood many coastal cities and vital ricegrowing areas such as the Mekong Delta in Vietnam.