National Geographic: Last week in New York, climate change took center stage. More than a hundred heads of state gathered to discuss the issue at a United Nations summit-and demonstrators filled the streets of Manhattan in what has been dubbed "the largest climate march in history."
The next step for climate negotiators is a meeting in Lima, Peru, later this year, followed by another in Paris in December 2015. There, it is hoped, diplomats will at last conclude the international agreement that has eluded them for...