Looking back one, two, and five years ago today on Worldchanging:

2009
Unscientific America 2: Buy The Book - And Read It
Joe Romm reviews Chris Mooney's and Sheril Kirshenbaum's book about how scientific illiteracy threatens our future...

2008
Buildings--the Biggest Bang for the Buck in Global CO2 Abatement
Jeremy Faludi says that The Vattenfall/McKinsey Report "A Cost Curve for Greenhouse Gas Reduction" contains a graph that everybody needs to see...

2005
Marketing Movies for Change
Micki Krimmel explores how movies can affect social change...

Other recent "look backs":
August 3
August 4
August 5