global warming as political science

[Brad DeLong]

>Hot Air is Bad for Us
>By Alexander Cockburn
>The current uproar over the posture of the Bush administration on 
>global warming and, most recently, on power plant emissions vividly 
>illustrate the political hypocrisy and opportunism imbuing debates 
>on environmental issues.
>
>Take first global warming. The charge that the current phase of 
>global warming can be attributed to greenhouse gases generated by 
>humans and their livestock is an article of faith among liberals... 
>Yet the so-called "anthropogenic origin" of global warming remains 
>entirely non-proven...

So what does Cockburn think is "not proven"?

--That human activity is dumping a lot of CO2 and CH4 and other 
things into the atmosphere?

--That over the next century human activity is going to dump a lot 
more CO2 and CH4 into the atmosphere?

--That human activity-produced CO2 and CH4--like other CO2 and CH4 
molecules--in the atmosphere trap heat?

What remains to be proven?

Brad DeLong