Seems like a trend now.
Check it out:

Climate scientists and environmentalists are venting their frustrations debating those who are skeptical of man-made global warming — and some have even gone so far as to refuse debating skeptics.

Dan Weiss, the director of climate strategy at the liberal Center for American Progress, refused to appear on Fox Business to debate climate skeptic Marc Morano last week. Morano runs the blog Climate Depot, where he reports on environment and climate news.