Answering Climate Change Skeptics, Naomi Oreskes

This was posted on Youtube in March 2010. In case you didn't see it then, its well worth listening to now. It is a lecture given by Naomi Oreskes, c0-author of the book "Merchants of Doubt". The lecture is one hour long, then about 15minutes of Q&A. It is well presented and informative. Check it out.
How a handful of powerful men deliberately use the method of 'doubt mongering' to challenge a scientific consensus, leading to uncertainty and therefore inaction.