Nobody ever said that man-made global warming would abolish natural cycles.

So attributing most or all recent reduction in Arctic ice cover to man-made global warming is speculative.

This in turn, he said, may help determine whether other efforts to detect man-made warming were on or close to target.

But Tyndall did show how man-made global warming can work; and he did so 150 years ago.

The majority of those with expertise in the field believe that man-made global warming is a serious, impending threat.

A slight global warming, either natural or man-made, is one suspect, but climatologists have no way of knowing for sure.

In 2008 there was a report of the first animal to go extinct due to man-made global warming- but this was based on a mistake.

Not bad science, like man-made global warming, but there are some awfully big error bars.

Today we are told there is a consensus around catastrophic man-made global warming.

He does not believe in man-made global warming.