While ground-level temperatures around the world have gone up, the warming has failed to penetrate the atmosphere. The atmosphere has actually been cooling in some large areas three kilometres above the Earth. According to computerised climate models, the warming should spread right through the troposphere, the bottom ten kilometres or so of the atmosphere. Sceptics argue that if the models are wrong about how surface warming influences temperatures in the troposphere, they are also likely to be wrong about the movement of water vapour between the surface and the upper troposphere. No, this is a myth.
All scientists believe in the greenhouse effect.
Without it the planet would be largely frozen. And all scientists accept that if humans put more greenhouse gases in the atmosphere it will tend to warm the planet. The only disagreement is over precisely how much warming will be amplified by feedbacks. A whole series of other feedbacks will influence the concentration of greenhouse gases in the atmosphere. Not all the CO 2 that we put into the atmosphere stays there.