Remember: the science just improves, and the science works.

http://en.wikipedia.org/wiki/Scientific_opinion_on_climate_c...

"The scientific opinion on climate change is that the Earth's climate system is unequivocally warming, and it is extremely likely (at least 95% probability) that humans are causing most of it through activities that increase concentrations of greenhouse gases in the atmosphere, such as deforestation and burning fossil fuels."