Reader WH sent along a link to this CBC Fifth Estate documentary — "The Denial Machine" — about the scientists and industries working to obfuscate basic global warming science. You can watch the full hour on their site.

As far as I can tell, it’s a full-on polemic. The Pielkes of the world will no doubt tsk-tsk, lament the lack of proper qualifications and hedges, and scold it for being shrill. But I say: more polemic, please.