Exxon Mobile says natural gas burns clean, but still releases CO2 gas, the cause of global warming. Now Exxon is developing a system to keep CO2 from getting into the air, and capture it safely, according to their commercial. If Exxon says global warming is real and the CO2 we put into the air is causing global warming. Why would anyone think differently? Educated scientist, oil producers and the rest of the world knows our CO2 gas emissions is causing global warming, but the Republicans here thinks differently. Can you see why we are considered the dumb Americans?