Google celebrates the Earth Day with this logo on 22nd April 2006.
The logo symbolically means to use to use the non-conventional natural resources like Solar Energy.

Learn more about Earth Day :
Reason We Celebrate The Earth Day:
To call attention to the environment.
Earth Day according to Wikipedia encyclopedia is:
Earth Day is a name used by two different observances held annually in the (northern) spring, both intended to inspire awareness of and appreciation for the Earth’s ostensibly fragile environment. Earth Day is in the public domain and open to all persons to shape. Some grassroots Earth Day organizers seek to move the date of the observance to the Summer Solstice, to take advantage of the warm temperatures in the Northern hemisphere (where most people live) to create greater participation.
Dates of Earth Day Celebrations:
2003: Tuesday, April 22
2004: Thursday, April 22
2005: Friday, April 22
2006: Saturday, April 22
2007: Sunday, April 22
2008: Tuesday, April 22
2009: Wednesday, April 22
Earth Day is always observed on April 22. International Earth Day is celebrated on the March equinox (March 20-21).
Celebrate Earth Day by Downloading and Installing this Earth Day Desktop Wallpaper.
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[...] I was first annoyed when Google had its special little cutesy logos for special days, but some how seemed to miss important American holidays, like Easter and Memorial Day. Of course, they found time to be able to celebrate days like “earth day”. [...]