Even the IPCC is quietly and unofficially gearing up for a major collapse in the global human population by 2050. And not a blip, either, but - by their _conservative_ estimates - a whopping 20+% _at minimum_.
Fear can motivate a lot of people. Massive changes in culture and in history have arisen out of mass (and often unjustified) fear. I say we _need_ this fear, and a lot more of it, too. We just need to impart it more accurately, and less bombastically (which is great for clicks and eyeballs, but often gives the wrong impression).