GAINESVILLE — Florida and Alaska are about as far apart as two states can be from be from each other physically, geographically and climate-wise. But U.S. Sen. Bill Nelson, D- Fla., on Monday said he’s witnessed the devastating effects global warming is already having on both states. “I walked to the edge of the glacier and saw that it’s really melting,” Nelson said of his mid-August visit to a US Coast Guard base in Kodiak, Alaska. He also recalled how Alton Road in Miami Beach was flooded during high tide before million-dollar pumps were installed. Nelson visited University of Florida...