I would rather celebrate "Human Being Day" than "Earth Day." The tendency in "Earth Day" celebrations is to long for the extinction of human beings so that Earth can live in unmolested peace. Lew Rockwell recalls "a sweatshirt a group of George Mason Univerity students gave me more than 20 years ago. It read: 'Earth Day? A Holiday for a Rotating Dirt Ball?'" The other theory: human beings are created in the Image of God to have dominion over the earth.
As human beings become richer, they become cleaner (less polluting).
Richer and Greener - Reason Magazine
Cafe Hayek: What Earth Day Means to Me
"Earth Day, 2009: The More You Know, the Less You Care" by Patrick J. Michaels (Cato Institute: Commentary)
April Frauds: Three manufactured holidays make fools of us all. - Reason Magazine
Yielding to Ideology Over Science : Why don't environmentalists celebrate modern farming on Earth Day? - Reason Magazine
Economics and Earth Day - Mises Economics Blog
Why Environmentalism is Evil