They should read the current studies out.
Check this out:

Greenpeace UK is soliciting donations to combat global warming with a video entitled “An Urgent Message From Santa.”

The video features a deeply depressed, creepy-looking Santa who claims that “melting ice” at the North Pole will force him to “cancel Christmas” unless world leaders act to stop global warming.

The Greenpeace “Santa” is played by British actor Jim Carter, a member of the environmental group who also plays the butler in the popular PBS “Downton Abbey” TV series.