Need HELP with this LIE...32,000 Scientist against AGW [View all]

I know this is just yet another game the Denialist play to confuse & use the general populist into thinking there is "REAL" opposition to Anthropogenic Global Warming/Climate Change.

I know the people signing this petition do not qualify to speak out against AGW...Or at least most of them do not. I know there are many other flaws to the claim that 32,000 "Scientist" have come out in opposition...What I need is help explaining this to a friend who has recently bought in to the propaganda!

Can someone point me to a website or provide me with some creditable sources that explains the trick be played by the Denialist?

Thank-you!