Re: As a representative of the tobacco industry, I would like to point out...

"Oh really? Which part of carbon dioxide absorbs infrared light and therefor heats up the atmosphere and hence more of it means more heat retained isn't reliably understood? Perhaps you have a new take on the physics you can share with us?"

First point, the greenhouse effect is about greenhouse glasses allowing sunlight to pass through from space, but then reflecting back heat from below. It isn't about CO2 absorbing infrared light. Secondly, many other gasses are far bigger causes of the greenhouse effect than CO2. Water vapour is about 100x the greenhouse gas that CO2 is. And funnily enough is way more unstable. We can't even decide whether it is a positive or negative feedback on the system. As things get hotter we produce more water vapour which increases the greenhouse effect; but at some point that vapour condenses into clouds which reflect sunlight back into space and reduce the greenhouse effect. If you bother to study the detail of the climate models being used in the research at the moment (and I have) you would notice that our understanding of the effects of water vapour on the cycle is close to zero, but we do know it has a huge effect on the results.