Evidence that humans cause global warming

A physicist from the Heidelberg Academy of Sciences in Germany has shown how to avoid subjective flaws of climate models by applying statistical analysis to data from the past 150 years.

"His research shows that, if you look at global warming as a puzzle, and you put together the natural factors such as increased solar radiation and reduced volcanic activity, a hole remains. The human factors of greenhouse gas and aerosol emission complete the picture."

See The human hand in global warming.