How Earth itself has dramatically upped the stakes for the Paris climate accord

Representatives from more than 150 countries will gather at the United Nations on Friday to officially sign a global accord aimed at slashing greenhouse gas emissions and slowing climate change. But in the four months since that historic pact was negotiated in Paris, a drumbeat of grim scientific findings has underscored that staving off the worst consequences of global warming may take far more aggressive actions.

FULL STORY: click here