It is rampant RM and seems to be quite pronounced here on HC as well. I would guesstimate there is a ratio of about 5:1 anti-AGW to pro-AGW of HC posters who post here on the general thread about climate related issues. I'm not having a go at anyone just describing what I have seen here.
Did you see the thing episode of Lateline about science scepticism? Was very enlightening. Its still on iView on the ABC web site if you haven't seen it. Link here on the General forum on another thread.