Read here and here. Not a surprise, really, and Lord Monckton probably enjoyed the opportunity to expose the behavior of the Copenhagen COP15 thuggish "global warming" advocates. American leftists/liberals have a long history, and very well documented, of anti-democratic proclivities/techniques associated with fascism and other leftist totalitarianism, which has now moved to the American and European environmental movements after the crushing death of communism.
Note in contrast how a typical climate skeptic challenges authority. Pretty scary and thuggish, huh?