This story was originally published by Huffington Post and is reproduced here as part of the Climate Desk collaboration.

“We invite you to comment on our page, but we ask that you be courteous and cite credible sources when sharing information.”

That’s the disclaimer posted atop NASA’s Global Climate Change Facebook page. And judging from the normally staid government agency’s response to a handful of climate change deniers who ran amok this week under a post by media personality Bill Nye, they mean it.