Sir David Attenborough on climate change

"There is no question that climate change is happening; the only arguable point is what part humans are playing in it," he says. "I would be absolutely astounded if population growth and industrialisation and all the stuff we are pumping into the atmosphere hadn't changed the climatic balance. Of course it has. There is no valid argument for denial." http://www.independent.co.uk/news/people/profiles/sir-david-attenborough-this-awful-summer-weve-only-ourselves-to-blame-7942405.html