LaClair said he was particularly upset about the book's treatment of global warming. The book says that "science doesn't know whether we are experiencing a dangerous level of global warming or how bad the greenhouse effect is, if it exists at all."
A newer edition published late last year was changed to say, "Science doesn't know how bad the greenhouse effect is," but the authors kept a phrase stating that global warming is "enmeshed in scientific uncertainty."
James Hansen, the director of NASA Goddard Institute for Space Studies, recently heard about La Clair's concerns and has lent him some support.
Hansen has sent Houghton Mifflin a letter stating that the book's discussion on global warming contained "a large number of clearly erroneous statements" that give students "the mistaken impression that the scientific evidence of global warming is doubtful and uncertain."
The current icon shows Polistra using a Personal Equation Machine.