Dozens of small island states said Monday that the accelerating climate crisis threatens their very existence. Their warning came as the U.N.’s Intergovernmental Panel on Climate Change issued its gravest warning yet on the climate crisis. In a statement, the Alliance of Small Island States said, “The stark fact is that if we keep warming to 1.5C we are still facing half a meter of sea level rise. But if we stop warming from reaching 2C, we can avoid a long term three meters of sea level rise. That is our very future, right there.”