The funny thing about this is that global warming doesn't even need greenhouse gases (though it is the main contributor). Mass-Energy conversion can cause global warming on its own. THAT'S RIGHT, E=MC^2 WILL KILL US ALL! And yes, that was sarcasm.
Lets do a quick thought experiment. Assume that the greenhouses gas levels stay constant for the next 500 years, while the power production levels increase linearly using non-renewable energy sources (Fission, a coal/oil power plant that recaptures all its emissions, a possible fusion power plant, etc...). Also assume that the amount of energy entering and leaving the Earth's atmosphere stays zero (a solid assumption, since if it's not zero then the Earth would have either completely boiled away or reached 0 degrees Kelvin, which we all know from thermodynamics is impossible).
Now, mass is converted to energy through the power plants and the energy used in our electronics. When the energy is used, it emits a portion of it as heat, thus putting more heat into the atmosphere. The Earth thus will warm up due to the fact that the energy flux of the atmosphere is a zero, so that extra heat generated by the power plants cannot escape into space. There you have global warming. Funny result isn't it?
The way to prevent this is quite simple; use power plants that don't involve mass-energy conversion. Hydro, wind, and solar are all good choices (photons are mass-less, so solar works).
EDIT: I originally wrote the flux should be a constant, it's actually zero. Zero is a constant, but any other constant would still be shitting for the Earth, so zero is necessary. The current global warming is caused by humans changing the value of that flux to something non-zero, thereby taking the Earth out of thermo-equilibrium.