Secrets to global warming may be found near Thoreau's Walden Pond

Thoreau's Walden Pond may hold the secrets to global warming, according to a
team of climate scientists.
Using historical data collected by famous naturalists and authors Henry David
Thoreau and Aldo Leopold, a team of scientists say that the effects of global
warming are now clearly evident, in part, by earlier flower blooms.
The [...]
Source:
http://www.ezonearticle.com/2013/01/17/secrets-to-global-warming-may-be-found-near-thoreaus-walden-pond/