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

2009
Green Building for All
Sarah Kuck looks at three examples from Portland, Oregon of how to achieve equity while building green...

2008
Stemming the Tide of Greenwashing
The Worldchanging team examines the media of greenwashing and new online watchdogs that can help you make more informed decisions...

2005
Project Unplugged and LifeStraw
Regine Debatty introduces two finalists in the INDEX Awards: a portable and flexible textile that converts sunlight into electricity, and a plastic straw/pipe filter that turns dirty water into clean, drinkable water...

Other recent "look backs":
May 18
May 19
May 20