Climate change deniers love to point to scientific uncertainty as justification for inaction on climate. But uncertainty is a reason for even more concerted action. We already know that projections historically have been too optimistic about the rates of ice sheet collapse and sea-level rise. Now it appears they are also underestimating the odds of extreme weather as well. The consequences of doing nothing grow by the day. The time to act is now.

Michael Mann

WashingtonPost