On Tuesday, the National Audubon Society released a report “Birds and Climate Change,” which interpreted an average northern shift of the over-wintering range of a large collection of North American bird species over the course of the past 40 years or so. Audubon decided that this range shift was due, in part, to “global warming.” Therefore, it was bad and action must be taken to avert it:

It is the complete picture of widespread movement and the failure of some species to move at all that illustrate the impacts of climate change on birds. They are sending us a powerful signal that we need to 1) take policy action to curb climate change and its impacts, and 2) help wildlife and ecosystems adapt to unavoidable habitat changes, even as we work to curb climate change itself.