Let's do another one. The idea that humans can and have had a big impact on climate is increasingly thriving. Apparently we are the central factor -Anthropocentrism. It started with Ruddiman who had produced a http://courses.eas.ualberta.ca/eas457/Ruddiman2003.pdf [Broken]. How come, well the paleolithic man started to change his environment, cutting down forests to build villages, burn fires and have land for agriculture. This would remove the carbon sink function and would increase the CO2 in the air. So what do you say about that?