"Exposure of global mountain systems to climate warming during the 21st Century". Global Environmental. 17 (3–4): 420–8. doi:10.1016/j.gloenvcha.2006.11.007. ↑ The Potential Effects Of Global Climate Change On The United States Report to Congress Editors: Joel B. Smith and Dennis Tirpak US-EPA December 1989 ↑ "Freshwater Issues at 'Heart of Humankind'S Hopes for Peace and Development'" (Press release).