The U.S. is a nation of islands--from Puerto Rico to Guam to Nantucket and more. But, the fate of these islands and the millions who live on them is at risk because of climate change. Think rising sea levels, increased frequency/intensity of storms and warming waters. My show this week is a prelude to Climate Week NYC and UN climate talks. I sit down with CBS News Weather Expert Jeff Beradelli and Arturo Garcia-Costas from NY Community Trust to assess first-hand how big this crisis really is, and what citizens can do.