It has been said that all scientists agree that man is causing a catastrophic change to climate.  As this clip illustrates, that simply is not true.  There are plenty who disagree, but who are simply shut out of the debate, or worse, called heretics.  It is reminiscent of the 1600's when Galileo was admonished by the church for his opinions on the motion of the Earth.  He was instructed neither to advocate nor teach Copernican astronomy.  Same story, different century.