RBCA is not positioned to tackle this global issue but here's an Alaska- Pacific Northwest link that's helpful in understanding the complexities:

A website on climate change for Alaska and the Pacific Northwest has
been developed by the Pacific Northwest Water Program.  It is designed
to mainly act as a portal to climate change information.  It has
information on regional climate change and there is a page for each
state plus topic areas that may be relevant to more than one state.
There are RSS feeds on each state page and a regional announcement page.
Just go to
www.pnwwaterweb.com <http://www.pnwwaterweb.com/> and click
on the climate change link under what's new.