London Free Press: In the middle of a hot summer, I think about the impact of climate change on birds.
Bird scientists have been more focused on this issue over the past decade. Results range from sobering to intriguing.
One of the largest recent studies was Audubon's Birds and Climate Change Report. Using 30 years of citizen science data, future ranges of 588 North American birds were plotted. Various birds' ranges are expected to expand, shrink, or shift.
As an example, by 2050 the hermit thrush -- a bird...