Global Warming Not Caused By Humans?

A small group of US scientists believe that human contribution to Global Warming is not significant as increases in carbon dioxide and other green house gases make only a meagre contribution towards global warming. Also satellite observations suggest that greenhouse models don't take into account the negative feedback produced by clouds and water vapour that curtail the warming effects of human carbon dioxide emissions. Fred Singer a climatologist believes that other factors like-- variations of solar winds and terrestrial magnetic field that impact cloud formations and the amount of sunlight reaching the Earth's surface, and thus determining the temperature -- are much more influential than human-generated greenhouse gas emissions.

Source Physorg