Yahoo joined the Earth Day festivities this year with a microsite, now the portal is expanding on its green commitment with a whole new channel. It all starts with the Be a Better Planet page, which encourages users to help their city win a fleet of hybrid taxis. Nice!

But will Yahoo's message get drowned out as everyone (and their brother) launches a green site? Mediaweek says this...

Yahoo said that eventually, the new site will feature green-specific news, as well as regularly updated content from several environmental organizations. The portal has also lined up licensed content from the eco-conscious site Lime.com, as well as blogs from environmental authorities. However, despite Yahoo’s size and portal-clout, the new channel faces a rapidly crowding marketplace. Besides Lime, Washingtonpost. Newsweek Interactive recently launched the similar Sprig.com, which Hearst has also rolled out The Daily Green.

One must wonder, just how energy efficient are the new servers being used to serve up all these "green" sites...