Global warming ghost of course.
Check this out:

Meteorologist Joe Bastardi told Sean Hannity on his syndicated radio program Monday that “it kills me to see people starving in the streets of our country, unemployed, and yet we’re shutting down coal plants and the energy lifeline because of what, a ghost?”

The ghost to whom Bastardi is referring is global warming. Hannity had asked Bastardi about an American vessel that will be performing a rescue mission of two ships, one Chinese and one Russian, stuck in Antarctica, the latter of which was performing global warming research.