Is global warming a scam?

Joel here-

To continue the debate on global warming and the proposed legislation to curtail its effects, I submit the following lecture given by professor Bob Carter.  This is in response to the discussion that Justin and I had on a previous post about the candidates voting records on environmental bills in congress.  For me, the most important points in this lecture are found in part 4 with the conclusions - I particularly found conclusions 4 and 5 the most applicable.  I welcome articulate and thoughtful comments and counter-arguments on the data and conclusions in the lecture.

Conclusions found in part 4 

1.  The assumption that prior to the industrial revolution the earth had a “stable” climate is simply wrong.

2. Climate has always changed, and always will.  There is nothing unusual about present-day rates of change.

3.  Atmospheric CO2 is neither a pollutant, nor the primary forcing agent for temperature change; rather, CO2 is a benefice for humankind.

4.  Attempting to stop climate change is an expensive act of utter futility.

5.  The only sensible thing to do about climate change is to prepare for it - in both directions. 

Parts 1 through 4 are in order below.  Each section is about 10 minutes.