Three prominent House liberals have called for what amounts to a mass burning of books and DVDs that question global warming and sent to 200,000 K-12 teachers, a ban rejected as an “April Fool’s joke” by the science institute that provided the materials for free.

“Is this a belated April Fool’s Day joke? If not, it should be. This is hilarious,” said Joseph Bast, president of the Heartland Institute.