1. The greenhouse signature is missing. We have been looking and measuring for years, and cannot find it.

Each possible cause of global warming has a different pattern of where in the planet the warming occurs first and the most... We have been measuring the atmosphere for decades using radiosondes: weather balloons with thermometers that radio back the temperature as the balloon ascends through the atmosphere. They show no hot spot. Whatsoever.

If there is no hot spot then an increased greenhouse effect is not the cause of global warming.

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

3. The satellites that measure the world's temperature all say that the warming trend ended in 2001, and that the temperature has dropped about 0.6C in the past year

4. ice cores show that in the past... half a million years, the temperature rises occurred on average 800 years before the accompanying rise in atmospheric carbon.

I bet he rides around in a gas powered vehicle too, that oil company sell out.....

It took him eight years to change his mind. He is a very resistant person. All he said now could be said in 1999.

Yes,he could have said it earlier but he didn't. In the end he listened to the science, and got over his preconceptions, I give him all the credit in the world for finally coming forward.