Mr. Essex and Mr. McKitrick explain, "But the Doctrine is not true. Each assertion is either manifestly false or the claim to know is false. Climate is one of the most challenging open problems in modern science. Some knowledgeable scientists believe that the climate problem can never be solved."
As Canadian energy economist Ross McKitrick notes in the Financial Post: "What is commonly called the 'mainstream' view of climate science is contained in the spread of results from computer models.