“Widespread and severe”—that’s how climate scientists from around the world have described the impacts of climate change in a new United Nations report published today. The report’s findings further affirm warnings scientists like me have been sharing for decades. More than three decades ago, during a congressional hearing on a hot July 1988 afternoon in Washington, D.C., Dr. James E. Hansen told our elected officials that it was already possible to detect a warming of the planet due primarily to an increase in carbon dioxide concentrations from fossil fuel burning.
