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Let me see if I can simplify climate change in a few bullet points for those of you who are interested.

1. It is not scientifically proven. By that, I mean the scientific method cannot be applied to the current climate models to prove any sort of change, warming, etc. It is far too complex for science to properly explain at this time. Models are supposedly improving, though.
2. CO2, like most atmospheric gases, does not pool. O2, N2, Argon, etc will also disperse and mix with each other despite that last one being the heaviest.
3. As philip mentioned, the sun is a huge factor. When the earth 10x the CO2 it has now, solar radiation was a fraction of that, thus it kinda evens out. Even now, solar radiation has been going down the past few years, leading to the unexpected lower temperatures as of late.
4. The number 1 greenhouse gas is... wait for it... water. It's not what you think, though. Look up the iris hypothesis.
5. There is more money to be had economically with climate change than without, so there is a bias to create research that supports it.
6. Climate change has largely been solved already. All we need is the human and economic willpower to implement the required changes. Muuuch easier said than done at this point. Maybe in due time. We're not in a rush
7. Speaking of rush, the temperature of the earth is stable at the moment, and it has been for centuries. The point of no return is when we start seeing a Gaussian curve in the temperature graph. In other words, temperature going up exponentially, not linearly. That is the signal of a true global warming event.
8. Lastly, and most importantly, we have come a long ways already in implementing changes, whether we believe it or not. More fuel efficient vehicles, smart thermostats, etc. People naturally want to spend less money overall for the same thing. With that, there's no reason why we need to force it upon people through regulation. It will happen on its own.