This is a tough question , as I think we should weigh the environmental impact of our travels against the potential for cultural and personal enrichment . Author Rachel Sussman 's book , ` ` The Oldest Living Tree , '' comes out on Earth Day . Sussman : When I visited , I saw a very old tree that inspired my project . She says this is important , and urges all of us to fight for change .
Author Rachel Sussman 's book , ` ` The Oldest Living Tree , '' comes out on Earth Day . Sussman : When I visited , I saw a very old tree that inspired my project . She says this is important , and urges all of us to fight for change .