Cloudy Climate Change

With this title, I don't want to bring the established science around Climate Change into discredit.
But I am worried that a lot of people still seriously doubt the validity of the CC concept.

Two days ago I was discussing CC with a colleague, and he basically didn't believe in it. It was all a conspiracy by some groups trying to impose emmission trading schemes on the masses in order to make a lot of money. He had this 'believe' mainly from a talkshow anchor from a local radio station.

Recent works around CC (like "Six degrees") state we have five years left to make up our minds. If we fail to act strongly, CC will run out of control and via the positive feedbacks we'll be heading towards the 'six degrees' scenario. A world that would be hard to imagine.

Still, there must be heaps of people thinking like my colleague. Confused by non-CC information that is flooding the internet and taken on by mindless talkshow presentors with the power to shape so many people's minds.

Especially worrying is the Climate Science Coalition. There are several websites of these, including one in New Zealand. There is a list of 33 recommended websites on this site, all more or less focussed on 'debunking' Climate Change. Sites like 'The carbon sense coalition', 'It's a scam!' and 'Ice Age now'.

There are complete videos there with interviews with 'scientists' and 'scientific evidence' that Climate Change isn't happening or at least not caused by human activity.

What is the best response to these Climate critics?

Do we ignore them with the risk that their efforts indeed convince an important part of the population and make strong action even more difficult.
Or do we actively discuss their arguments and presence, and work to make people realise that these arguments are false and the motives biased.

I would go for option two.