Just look at what else they are denying;
From Creationism to Anti-Environmentalism: The Religious Right's Attack on Science Expands
It can no longer be a surprise to anyone that a very vocal and well-funded minority of Christian extremists continue to attack evolutionary theory in the name of their narrow brand of religion. In addition to their attempt to distort the scientific record, these people work hard to fool the media and the general public into believing that they are something other than a fringe group.
In fact, their science is completely at odds with that being promoted by the world's leading scientific societies, and their religious perspective is very far removed from those of the vast majority of the world's religious denominations.
This same collection of religious extremists has now decided to broaden its fight on modern science in the name of religion. Under the auspices of the Cornwall Alliance, a group espousing a "Biblical view" of environmental stewardship, which largely means that anthropogenic global warming is an anti-Biblical myth, environmentalism is now under attack.
Apparently, environmentalism is "deadly to the gospel of Jesus Christ." E. Calvin Beisner, founder of the Cornwall Alliance, outlines his position as clearly as anyone could wish: "The environmental movement has actually become what I call the cult of the green dragon. And we need to be prepared as Christians to rescue people from that cult."