Am amazing array of research news, NGO sources, and agency collaboration is pointing to links between bird populations, bird migration and climate change.
The Point Reyes Bird Observatory (PRBO) has a page devoted to this topic, here.
Partners In Flight has a bibliography on climate and birds here.
A link to a page on Nature Canada's website addresses the birds and climate change issue.
The Encyclopedia of Earth has new information on climate change, with a special collection of information here. News on climate change from Earth News is available here.
Climate Change Wales has info on the effects on birds in the western United Kingdom at their site, here.