redOrbit: Preeminent climate scientist and noted environmental leaders speak out on behalf of the Kiribati Nation, calling upon world leaders who will gather this month at the Economic Summit in Seoul and the U.N. Climate talks in Cancun to address the issue of water scarcity and its impact on food sources. James Hansen, world renowned climate scientist, Lester Brown, Founder and President of Earth Policy Institute, Rabbi Warren Stone, religious environmental activist who served as delegate at the U.N. climate…