For decades, scientists have warned that climate change would disrupt almost every natural life-sustaining system on our planet. What have we done about it? We’ve dithered. We refuse to believe the evidence, or rail against the cost and inconvenience of change, or hope the problem will just go away. But global warming is not going away. Last month, the Intergovernmental Panel on Climate Change issued its most alarming report yet: Earth is on the edge of ecological bankruptcy.