There is no evidence that carbon emissions cause significant global warming. None.

On global warming, public policy is where the science was in 1998. Due to new evidence, science has since moved off in a different direction.

The UN science body on this matter, the IPCC, is a political body composed mainly of bureaucrats. So far it has resisted acknowledging the new evidence. But as Lord Keynes famously asked, "When the facts change, I change my mind. What do you do, sir?"

Four things have changed since 1998.

First, the new ice cores shows that in the six global warmings over the past half a million years, temperature rises and falls occurred on average 800 years before the accompanying rises and falls in atmospheric carbon. The carbon rises could not have either started or ended the temperature rises. So there must be natural influences on global temperatures that are more powerful than atmospheric carbon levels.