Pre-eminent climate scientist James Hansen has published a new paper. Spoiler alert: It’s not good news. Hansen, who was the first scientist to call major attention to climate change in 1988, has found that the most dire consequences of climate change could happen one or two decades sooner than previously thought. That means collapsing ice sheets, violent storms and waves so strong that they could toss boulders onto the shore. How soon could this happen, and what will it mean for everyday life?