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

2009
Blue Gold: The Fight to Stop the Corporate Theft of the World’s Water
This piece is a part of "Resources from the Worldchanging Library."
In Blue Gold: The Fight to Stop the Corporate Theft of the World's Water, authors and activists Maude Barlow and Tony Clark aim to document the rapid privatization and commodification of water...

2008
Spatial History and the Mannahatta Project
Alex Steffen explores the merging movement of information visualization and the Spatial History Project...

2005
Terraforming Earth IV: The Question of Methane
Jamais Cascio responds to an article outlining a "tipping point" in the Siberian arctic, and examines the ramifications of rapid methane release into the atmosphere...

Other recent "look backs":
August 6
August 9
August 10