Looking back one, two and five years ago today (give or take) on Worldchanging:

2009
Russian Activist Seeks End to Soviet Toxic Legacies
Since the collapse of the Soviet Union in the early 1990s, hordes of banned chemicals have been uncovered throughout Eastern Europe and Central Asia. Poorer communities often lack the capacity to dispose of the dangerous pesticides. Despite international bans, farmers continue to distribute the chemicals. Olga Speranskaya, director of the chemical safety program at the Eco-Accord Center, a Russian environmental group was honored with the 2009 Goldman Environment Prize for Europe. She leads a region wide network of community, government, industry, and scientific leaders tasked with rooting out the toxic legacies...

2008
Book Review: Seven Wonders
Sarah Kuck reviews Sightline’s new book Seven Wonders for a Cool Planet: Everyday Things to Help Solve Global Warming. Eric Sorensen and the staff of Sightline Institute created a pithy, action-oriented book dripping with insightful Worldchanging ideas...

2005
The Rise of the Participatory Panopticon
James Cascio muses that soon -- probably within the next decade, certainly within the next two -- we'll be living in a world where what we see, what we hear, what we experience will be recorded wherever we go. There will be few statements or scenes that will go unnoticed, or unremembered. Our day to day lives will be archived and saved. What's more, these archives will be available over the net for recollection, analysis, even sharing. And we will be doing it to ourselves...

Other recent "look backs":
April 29
April 30
May 3