re: #275 Charles

The scientific data is very clear. Anyone who denies that CO₂ is a major contributing factor to global warming is either: 1) not interested in the real scientific evidence, or 2) repeating talking points from the very deniers I identified at the top of this thread.

OK. Then please tell me how many Fahrenheit degrees of global temperature increase over, say, the last 100 years, have been proven to your satisfaction to be directly attributable to human carbon dioxide emissions?