Why do politicians "believe" in global warming?

Why do politicians "believe" in global warming when it is patently at best an exaggeration and at worst a complete con? Harmless Sky has an answer, or rather 12 of them, do take a look at them all but here are a few:

"1. Talking about climate change is the nearest a politician will ever come to risk free politics. If you don’t believe me, just name one politician whose career has been damaged by joining the crusade against global warming. Proclaiming your intention to cut greenhouse gases by 99.9% before the end of next millennium is so much safer than suggesting a date for troop withdrawals from Iraq, or promising to sort out problems in the National Health Service.

5. Politicians who have achieved ministerial office quickly learn that the campaign against climate change requires new departments, more staff, bigger budgets and new quangos for their friends to run. In other words it is very good for business, if you are in the business of maximising your power and influence.

6. Politicians who hold forth about the economy often run into trouble because they don’t know very much about economics, and economists love putting politicians right. This can’t happen with climate change because the only people who can challenge your more exaggerated claims authoritatively are climate scientists, and why would they do that when their funding depends on global warming?

9. There are obvious fiscal benefits; lots of scope for new taxes and some of them not too obvious either. And you can reassure people that these taxes have nothing to do with ‘black holes’ in the public finances too, its really all about changing climate wrecking human behaviour."