President Trump is delaying decision on the U.S. participation in the Paris climate accord, a deal brokered by Obama which Trump has repeatedly criticized. Natalie Mahowald a professor in Cornell University’s Department of Earth and Atmospheric Sciences, Faculty Director of Environment at the Atkinson Center for a Sustainable Future at Cornell University and an expert on global and regional impact of climate change says it would be unfortunate if the Trump administration chose to forgo leadership on climate change.