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

2009
Worldchanging Interview: Shawn Frayne
Adele Peters interviews Shawn Frayne, president of Honolulu- and Hong Kong-based Humdinger Wind Energy, and a prolific inventor and innovator whose work has been inspired by the need for resourceful problem-solving in the world's most vulnerable regions...

2008
Resilient Community
Alex Steffen responds to John Robb's on-going series of posts on Resilient Community and argues that they're a source of both worry and insight...

2005
Gil Friend & Jane Byrd: Have mercy, I cry, City!
Since we now live on a majority urban planet, how can we make it thrive and avoid living in cramped, desolate hardscapes? James Cascio argues that the key to surviving urban density are photosynthesis, economy, and conviviality...

Other recent "look backs":
June 29
June 30
July 1