Looking back one and five years ago today on Worldchanging:

2009
New Yorkers to Create PreFab Parks for Park(ing) Day
Sean Conroe shares a video about Park(ing) Day 2009 and encourages everyone to share images and more videos on Worldchanging's Flickr photo pool...

2005
Brand Sensitivity to Climate
Jamais Cascio reports on the UK's Carbon Trust, a government-sponsored initiative to study the social and economic factors related to a need to reduce greenhouse gases...

Other recent "look backs":
August 5
August 6
August 9