Three I see consistently are:
Scientists need to use scare tactics to get funding. Climatologists are using this method for money.
It is a conspiracy to fleece people through new taxes. The carbon tax and Gore's association with this are usually brought up.
The advanced nations are involved in a conspiracy to hinder the development of third-world nations. By restricting the forms of energy sources they can use, we are consolidating our position at the top of the global pile.
It's not unusual to find all three together.
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