The real purveyor of the climate is the Sun. Solar activity can increase and decrease in magnitude just like everything in nature, making our solar system depend on its life-giving light and radiation. When solar activity (solar flares, et cetera) increases, the amount of radiance emitted from the sun to particular spots on Earth increases. One can easily experience this sitting outside on a sunny day, and also the benefits of cloud cover during times of extremely toasty days. The more cloud cover, the more radiation is projected back towards the sun through the processes of absorption and scattering of radiance.
If the Sun were to ignite massive, historic solar flares for a along period of time, the Earth would naturally absorb more radiance, and hence have a higher temperature. But right now it is the complete opposite -- the sun has become quite calm over the past decade, with solar activity at a minimum in recent history. So we have actually experienced somewhat of a global cooling trend recently.
It's very hard to come to a decent conclusion on the hypothesis of man-made global warming because trends show us that CO2 actually lags temperature. When temperatures increase, CO2 levels seem to increase. But nothing is conclusive the other way around. What does contribute to a small portion of Global Warming is deforestation and the "urban heat effect" which has to do with more reflecting of radiation instead of absorption because of the lack of green space. But that is just a minimal contribution, with heat escaping at night anyway.
CO2 is critical to the Earth's atmosphere. It is essential for vegetation to receive copious amounts of CO2 during photosynthesis, basically their own oxygen, so that they can provide plentiful greenery and also food. I find it quite strange, morbid, even, to suggest that CO2 is a poison gas, because without it we wouldn't exist.
And considering this, the last thing I'd want to do is destroy an economy because of a theory that has not been proven. If the Sun were to explode with vicious solar flares over the next year, no amount of CO2 conservation is going to help us because we'd most like fry anyway. To think we could halt that is human hubris at best.