3 simple lemmas to prove anthropogenic climate change due to CO2 emissions:
1. CO2 has "greenhouse" properties. It let visible light pass, but absorb and re-emit light in the infrared spectrum. In fact, this behavior is exactly how we measure CO2 in the atmosphere, look up cavity ring down specstroscopy
2. CO2 in the atmosphere have been rising due to fossil fuel emissions. This is known from the ratio between C-12 and C-13 of CO2 (pic related). Fossil fuel has a light isotope signature.
3. Add 1+2 and you get warming effect from greenhouse gas forcing. The greenhouse gas forcing creates an energy imbalance, where there's more energy coming into earth than leaving. This is measurable via satelite
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JD012105You put your sensor to the sun (energy in) and you put another sensor to the earth (energy out). Integrate over the area as the satellite orbits the earth. 2nd law of thermodynamics states that energy must be conserved, if a system is raking in more energy, then temperature must increase.
1+2+3 = temperature increase driven by fossil fuel emission. All simple, 19th century physics confirmed by modern 21st century observations.
