All done
Q2 ??? Feedback for h20 is not positive. Also no trpospheric hot spot. A: many uncertainties. Possible that RH has gone down. That's why wide uncertainty estimates.
Q1 Mike Kelly. Can we estimate past h20 levels. What is the effect? Can be done. Doesn't know answer.
Such rapid change is rare in Earth history
Good reason to believe that this will change ckimate. Not certain.
Increase in co2 definitelyanthropogenic
Long calc to get to estimates. Includes estimate of climate sensitivity which gives estimate of rate of rock weathering.
No long term measurements of co2 (>550my). Only proxies.
Talking about co2 lagging temp. V uncertain Not consistent with idea that co2 is a cause he says. yay!!! Consistent with amplifying effect.
Close relationship between atm co2 and antarctic consistent with greenhouse theory.
Discussion of water vapour as a GHG.
Radiative transfer calcs are well known and simple
Decline in atmospheric o2 matches rise in co2, so co2 can't be coming from volcanoes. Must be burning of fossil fuels. Oceans and land taking up co2