“There are two takeaways from this graph. One is the complexity of the spectra—hundreds of thousands of molecular properties, many measured in the laboratory, go into creating these simulated spectra, which agree very well with satellite observations. Second, although the effect of CO2 at today’s concentration is significant (7.6 percent), doubling it doesn’t change things much (an additional 0.8 percent) due to the “painting a black window” effect we’ve already discussed.”