Doubling the atmospheric CO2 does not double the "greenhouse effect". Just like doubling the power in a stereo speaker system. If you are blasting out music at 100 watts (loud), and double the output to 200 watts, it does not get twice as loud. You only get a 3 decibel gain. Double it again to 400 watts, another 3 dB gain. Double it again to 800 watts, another 3 dB gain.
Doubling the atmospheric CO2 does not double the "greenhouse effect".
Just like doubling the power in a stereo speaker system.
If you are blasting out music at 100 watts (loud), and double the output to 200 watts, it does not get twice as loud.
You only get a 3 decibel gain.
Double it again to 400 watts, another 3 dB gain.
Double it again to 800 watts, another 3 dB gain.
Nobody said doubling the atmospheric CO2 doubles the greenhouse effect.
A geologist going climate propagandist?