The idea that all life on this planet is in jeopardy if America doesn’t wean itself from fossil fuels is just hyperbole. ‘Climate change is an existential crisis,” Senator Elizabeth Warren declared Tuesday, unveiling her plan to fight climate change in advance of CNN’s interminable townhall event on the topic with ten Democratic presidential candidates. The use of the term “existential crisis” is ironic. No doubt, they mean “existential threat,” i.e. that global warming threatens to end life on earth. It doesn’t. But we’ll get back to that in a second. The term “existential crisis” comes from psychology or philosophy,...