Isn`t that their fall back theory, that AGW = global cooling?
Their theory is that if we can scare the people with the boogie man we create and which they do not understand, the public will give us money and power to protect them from the boogieman which we created.
Basically the same way a Witch-Doctor works in primitive cultures.
The planet has been much colder in the past, and the geological evidence actually favors Global cooling.
But these Witch-Doctor-like yahoos don't really care what the excuse is, they only care about money and empowerment. They only care about the ability to command other people to do as they bid.
Their motivation is as old as humanity.