I do understand the greenhouse effect.
"Solar energy absorbed at Earth’s surface is radiated back into the atmosphere as heat. "
What you don't seem to understand is that the energy radiating from the earths surface is longwave infrared energy, this energy is emitted in a range of wavelengths, CO2 and methane only absorb certain wavelengths in certain bands, for example Methane absorbs in the frequency of 4 microns, CO2 around 11 and 12 microns.
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Human emissions of CO2 are 3.6 %, so since the industrial revolution CO2 has increased from 280ppm to 430ppm an increase of 150ppm.
So, the human contribution is 5.4ppm, not enough to worry about.
Most of the increase comes from the oceans as they warm, they outgas just like leaving a bottle of coke in the sun.
Greenland ice cores have shown that warming always precedes an increase in CO2
Man-Made CO2 from burning hydrocarbons, making cement, and other industrial processes adds only 1.2% to atmospheric CO2 per year. The other 2% attributed to "Man-Made" in the diagram below is from land-use change, and like all CO2 in the bio-carbon cycle it's "carbon neutral". The emissions would have occurred anyway, we only made it happen sooner rather than later.
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