Interesting claims from James Hansen

An excerpt from James Hansen's testimony in a recent Iowa coal case (October 2007):

...Humans now control global climate, for better or worse.

Another ice age cannot occur unless humans go extinct, or unless humans decide that they want an ice age. However, ‘achieving’ an ice age would be a huge task. In contrast,
prevention of an ice age is a trivial task for humans, requiring only a ‘thimbleful’ of CFCs (chlorofluorocarbons), for example.

(James Hansen is one of the best-known climate alarmists).