Associated Press: President Barack Obama is framing the challenges of climate change as a matter of national security that threatens to aggravate poverty and political instability around the globe and jeopardize the readiness of U.S. forces. "Make no mistake, it will impact how our military defends our country," the president says in excerpts of a commencement address prepared for delivery Wednesday at the U.S. Coast Guard Academy in New London, Connecticut. "And so we need to act and we need to act now." The president...