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

2009
Greener By Design 2009
Jeremy Faludi reports on some of green innovations showcased at the 2009 Greener By Design conference, including Method's life cycle assessment of laundry detergent packaging and Frito Lay's new compostable chip bags...

2008
Extra Cheese, Hold the Methane
Julia Levitt reports on a genetically modified grass that is more easily digested by cows, which allows them to graze without producing so much methane gas. She then warns against seeing this development as a way for humans to continue our love affair with meat and dairy products...

2005
Bainbridge Graduate Institute
Alex Steffen profiles the Bainbridge Graduate Institute, arguably the most worldchanging of business schools...

Other recent "look backs":
May 24
May 25
May 26