Earth's age is often debated, but Earth Day is 43 years old today.
Earth Day was born in 1970, a creation in large part of efforts by Gaylord Nelson, a Democratic U.S. Senator from Wisconsin, who died in 2005.
Denis Hayes, the national coordinator of that first day, said that he thought it had achieved many of its aims, despite the challenges of modern times.
Earth Day is designed to "[activate] individuals and organizations to strengthen the collective fight against man's exploitive relationship with the planet."
As for the outlook on Earth Day 2013?