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

2009
What is a City of the Future?
Bill Becker explores how city officials are faced with the issue of how to spend money: "Will they use the money to become cities of the past or cities of the future? What is a city of the future, anyway?"...

2008
Nothing for today!

2005
Climate Lawsuits
Bruce Sterling, in his Viridian mailings, often draws an explicit comparison between greenhouse gas-emitting industries and tobacco companies, arguing that the same kind of lawsuits that have hammered the cigarette companies are likely to hit oil, auto and other heavy-CO2 companies, too. But now he's not alone in making that argument...

Other recent "look backs":
May 28
May 31
June 1