I have just received the current issue of Econ Journal Watch, which is a Symposium on the US Sovereign Debt Crisis. Click here to see this issue of EJW. Tyler Cowen, in his introductory remarks, suggests that the US will experience a debt crisis within the next one or two decades. The US federal government is currently borrowing 40 cents of every dollar its spends - is this really sustainable in the long run? I don't think we will see a total default by the US, but a partial one, with the Fed attempting to raise the inflation rate.
The Berkeley Earth Project , an independent study of global warming, has found that the earth has become a degree warmer over the past half century. However, the statistical uncertainty surrounding pre-1920 estimates makes it very hard to say much about long-term trends - click here for graph . This is one of my concerns with the global warming debate - we simply don't have trustworthy long-run data which looks at temperature changes over the last millennium (or two). My second concern with the global warming debate is that it is very hard to prove any sort of casual link between global warming and human activity. The scientists may be able to show correlation between global warming and our production of carbon dioxides etc., but correlation is not causation. My third concern with the debate is that those who are sceptical or agnostic are stereotyped as flat-earthers or intellectually-challenged crackpots. This only stifles debate and the progress of science itself.