The world is whiffing on its biggest climate goal

Even as we strive to limit climate change, we need to brace for the warming we can no longer prevent. | Neil Milton/SOPA Images/LightRocket via Getty Images This story appeared in Today, Explained, a daily newsletter that helps you understand the most compelling news and stories of the day. Subscribe here. For more than a decade, 1.5 degrees Celsius has been the watchword — er, watch temperature? — of climate policy. If the world could hold warming at that level, it could stave off some of…