End game.
What's the end game of the left?
No rising seas and worsening weather, or at the very least just leaving the world in better shape than they found it. So, let's say (just for the sake of argument) that you're right and global warming is a fraud, what then? "Well, we proved them all wrong. And now they've left us with a nice place to live. Ass holes."
That's my whole point, even if it's all a fraud, pollution controls are reasonable on their own (localized) merits.
That leaves me with nothing in my (not insubstantial) repertoire of political motivations and ideologies to inform on the motive behind discrediting climate science. The one proximate, logical, cause / effect motivation would be that pollution controls are an unreasonable burden. It's a fair point on it's own (though demonstrably false to my mind). I am just suspect of the litany of information against it that is unlinked to any productive policy positions.
So I don't doubt that someone genuinely is motivated by not drowning in midtown or cigar city, and so they support policy changes like pairs and Kyoto. Nor do I doubt the motivation of someone who is skeptical of it, but nevertheless content to support pollution controls on the basis that they'll benefit by living in the nicer environment. I do doubt the motivation of someone who aims to discredit those ideas without also linking it to cohesive policy goals.
I'm literally left with no understanding of it beyond the unreasonable burden motive or the malice motive. And given that the economic burden motive had been all but absent from any recent discourse, it really does come across as "I don't have nice things, so I want to ruin yours" malice motive.
So, educate me. What's your motive.