I stopped reading when it said CO2 is the main greenhouse gas. That would be water vapor, by a large factor.
True, but H2O is a given. While its concentration is constantly changing in the air at a given point, that concentration is driven largely by temperature, not human activity.
In contrast, people really have significantly increased the concentration of CO2. We can argue about what that means, but not that it has happened.
Roger that! See my #15.