Against a backdrop of deepening concern about the growing impact of global warming, the Climate Action Summit was held at the UN in September last year. Climate change represents a threat to all people living on Earth, both now and in future generations. Like nuclear weapons, it is a fundamental challenge on which the fate of humankind hinges. Precisely because climate change is an issue that will leave no one untouched, it has the potential to catalyze heretofore unseen global action.