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

2009
Climate Debate Overlooks Small Businesses
As the United States debates how it should tackle climate change, "Big Business" has generally received the most political attention. Small companies are mostly disengaged from the climate debate, businesses advocates say, yet environmentally conscious, small enterprises could become influential supporters of climate legislation...

2008
The Nexus of Peak Oil, Climate Change and Infrastructure
The creation an efficient, effective and fair U.S. climate policy is utterly important, and overdue. But, as Bryn Davidson, founder of the Dynamic Cities Project, argues, unless we take Peak Oil into consideration, we may end up in a situation that pits energy security against climate change concerns...

2005
Bruce Sterling: Can Technology Save the Planet?
Sierra magazine commissioned a piece from Worldchanging Ally #1, Bruce Sterling, that covers the debate about how to build a bright green future...

Other recent "look backs":
June 10
June 11
June 14