Climate change is the term used for the result of global warming. Global warming is the result of increasing greenhouse gasses in the atmosphere. It is pure physics that the Earth receives energy from the sun and radiates it out as infrared. Gasses that block infrared keep more of the energy from radiating back out to space and cause the Earth as a whole to increase in temperature. This is the greenhouse effect that was first discovered around 1820 by the French mathematician Jean-Baptiste Joseph Fourier who served in Napoleon's army. Today, thanks to quantum mechanics, we can calculate the amount of temperature increase of the Earth for any increase in greenhouse gasses.
What is difficult to model is the effect on the atmosphere, including the oceans, of the increased temperature of the Earth as a whole. Oceanic phytoplankton are responsible for half of our oxygen so if temperature and acidification kill them off we are screwed.
If you want to argue with the physics stop wasting time on DR and find a college, take some physics and the prerequisite calculus courses, and get back to us.