From June 23, 2010, article from Grist:
Spring certainly seems to arrive earlier these days than it used to. But is it a sure sign of global warming or just natural variability? After decades of careful research on wildflowers, University of Maryland ecologist David Inouye has some definitive — and disturbing — answers. This summer Inouye returns to the Rocky Mountain Biological Laboratory for the 40th consecutive year to study changes in wildflower populations some 9,500 feet high in the Rocky Mountains near Crested Butte, Colo. His work offers some of the most detailed understanding yet about climate change and its effects on alpine plant and animal species.
Read more here.