[schoen]

Note that "existential threat" has a technical meaning which excludes things that cause the collapse of your economy, livelihood, and way of life, as well as causing hundreds of millions of people to die. So, "climate change is not an existential threat" doesn't contract even the claim that climate change is the most serious threat that humanity currently faces. :-)

But it's also true that pretty much no scientists believe that climate change is an existential threat, and also true that people can be punished for pointing that out.