If you had 100,000 people in a football stadium, and each one represented a molecule in the atmosphere – how many would be CO2?
H2O – 1,000
CO2 – 40
Methane – 0
H2O is a much more effective greenhouse gas than CO2, and it is also vastly more abundant. Changes in atmospheric CO2 and Methane levels are just noise. People who claim otherwise are simply not very bright.