Both THEORIES are wrong.

The global change phenomenon has very little or nothing to do with the so called greenhouse gasses.
I will not go to detail in explaining it again, but if you keep your observation skills unbiased you will notice that the changes to the weather and the climate are tied to the kinetic energy of the molecules that make up the atmosphere.
Not only that; but since the phenomenon is tied to the laws of physics, it is possible to predict what will happen.
The average temperature will remain approximately the same as it has always been, but the temperature swings will be quicker and the highs and the lows will be more extreme.

The phenomenon is manmade, though man does not understand how he caused it.😞