Case Study: California
I certainly hope the viticultural areas aren't affected too much...
California Climate Change Portal: A variety of resources; the highlight is the latest edition of the biennial report o
n the effects of climate change on California (114-page PDF file).
Shorter article about global climate changes' influence on California.
How climate change will exacerbate California's problems with insect pests.
The Climate Change Program at the California EPA, Air Resources Board. Lots of stuff here; best starting place for investigating AB 32, the 2006 Global Warming Solutions Act.
For other stuff about California in a changing climate, see Other Natural Resources/Water.