AT:  Such simplistic reasoning is ill-becoming.  Overuse of any resource destroys that resource.....that's the basis for the term "overuse."    ?This is a exerpt from a Guardian article re : the Galapagos Islands "It's heartbreaking to see what is happening to the islands. Dorothy Cross, an Irish artist who participated in the programme, had visited the Galápagos 12 years previously, and was shocked by how much it had changed. "I really felt disquiet. Being there felt like a very difficult predicament. I live in nature and a lot of my work is rooted in nature and in the Galápagos this extraordinariness is being undermined by tourism and money."

'Oh Yes - We are destroying the earth by walking on it...YAWN'  yes,indeed, AT, in many places we are, indeed, doing so.  Gary Crum