If caused by increased CO2, what happened to reverse the warming in the past?
And if so, do you think that rises in CO2 would have no effect? Did you ever study physics or chemistry? The laws of equilibrium? Every action will have an equal and opposite reaction? This is basic stuff...dumping huge amounts of CO2 into the atmosphere will have an effect. The exact effect is not known 100% b/c there are so many variables, but that doesn't mean that nothing will happen.
All true, but we also don't know if what will happen will be good or bad. Extremes suck, but in general global warming is a lot better than global cooling.
Also, have you seen the laser nuclear fusion stories? The problem will likely resolve itself as technology emerges or we run out of fossil fuels.
Link: http://www.independent.co.uk/news/science/the-lasers-fuelling-hopes-of-unlimited-clean-nuclear-energy-9124237.html