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

2009
Worldchanging Review: Planet Forward
Sarah Kuck reviews a new web and TV project called Planet Forward, a show that focuses on the dialogue between local people, organization leaders and government officials on planet-focused topics.

2008
Book Review - An Atlas of Radical Cartography
Add this book to your bookshelf! An Atlas of Radical Cartography is a collection of 10 maps and 10 essays about social issues from globalization to garbage; surveillance to extraordinary rendition; statelessness to visibility; deportation to migration.

2005
Plastic Electronics and the Ink-Jet Future
Five years ago 3-D printing digital fabrication technology was just beginning. James Cascio explores the emerging new applications of ink jet technology and asks readers what would be required to make a 3-D printing world sustainable?

Other recent "look backs":
April 8
April 9
April 12