Google displays this logo today across all its home pages, Celebrating Earth Day (April 22, 2008)
Yu can checkout the previous earth day logos here: 2007, 2006, 2005, 2004, 2003, 2002, 2001.
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This is by far my favourite google logo. The Earth needs our attention far more than any other dead person, cause or invention.
Google has a terrific opportunity to raise the awareness for whatever they see fit. Hundreds upon hundreds of millions of people see are exposed to these special logos.
I urge google not to waste it on trivial historic events, or it’ll become ineffective.