Earth Day 2010 is being celebrated today, April 22, 2010, and this year is extra special, as it is Earth Day's 40th anniversary.
The first Earth Day was observed in 1970. The Earth Day Network notes on its Web site:
Forty years after the first Earth Day, the world is in greater peril than ever. While climate change is the greatest challenge of our time, it also presents the greatest opportunity - an unprecedented opportunity to build a healthy, prosperous, clean energy economy now and for the future.
Follow this historic occasion LIVE via our curated Twitter lists below of Earth Day, environment, and green living accounts.
Know of a great Twitter user for any of these categories? Let us know at firstname.lastname@example.org!