Tue 5/22/2012 4:07 PM
|This week I have some bad news for you. Late 20th century warming was not natural event in Australasia, but it seems that we did it with our fossil fuels. When we started warming up the Earth with carbon dioxide from fossil fuels, I guess we just didn’t realize that climate sensitivity is bigger for that than for solar forcing. We see that for example in tropospheric water vapor increase and in oceanic warming. Summer monsoon is also weakening and making air pollution situation even worse. Humans might be affected too, as has happened during past climate changes.So what do we do? We start using biofuels, but that then seems to destroy stratospheric ozone, which protects us from solar UV radiation. El Niño is of no help, because it just mixes up the carbon dioxide in the atmosphere. We could try to see if we can identify tree rings in Ethiopia, but that might be just fun recreational activity and might not actually help. Perhaps we should just hope that climate sensitivity is not that bad. After all, there is uncertainty in cloud feedback, so it might be that we only get 2+ Kelvins of warming. Perhaps best thing to do is to sit back, read some more studies next week, and hope they come up with a plan for us, right?