Maybe it was the movie about the "pod" people that Donald Sutherland was in years ago. All I remember is that the folks taken over by the aliens started screaming upon discovering people that were still human.

While their numbers are slowly shrinking and in many cases the climate change deniers, at least the most extreme, can be simply ignored, the fact that Americans in general are scientifically uninformed and oftentimes elect politicians that are equally challenged, means that the deniers are not completely harmless nor irrelevant.

We have in the White House right now, for example, an individual that may have committed irreparable harm to not only the U.S. and will, in my opinion, turn out to be one of the worst disasters in American history.

A list that one person has offered is as good as any I've come across recently. Have the "reasonable" skeptic/denier provide the following information:
1. Testable hypotheses
2. Data
3. Body of scientific work
4. Equations
5. Models
6. Analyses of own data

You'll probably be met with total silence in most cases.

For those that refer to climate change or global warming as some sort of hoax, conspiracy or "socialist" plot, tell them to send you the "intercepted" e-mails, information from the whistle blowers and the funding records that demonstrate how climate scientists have manipulated this massive, worldwide conspiracy.

Above all ask for the links to the conspiracy information. Last but not least demand that these deniers send you the links from working climate scientists who have had articles submitted for peer review.

The point of all this is not that you'll likely get anything substantive from the denier crowd, but that climate change and its related components are too important to be delayed or thwarted by their nonsense any longer.

Much of this is about continually educating people and, yes, confronting deliberate falsehoods.