But none of these things outright threaten the existence of humanity. Even the dreaded Bee collapse might still be manageable or at least tolerable as humanity adapts/reverts to something else.
Sure, it sucks for the species going exctinct, and the Center for Biological Diversity is going to meltdown, but ah, well. As long as humanity can live, no one will really care. That's the key point. If wheat, chickens, and the like were starting to die off, then people would be rioting, but honestly, technological civilization can survive this, most people will die in their beds, and while the polities will probably change, maybe even drastically, Humanity still survives.
What we're seeing is Humanity turning Earth into its first colony; a truly managed world. Instead of retreating away and dividing civilization from nature to reduce impact, we kept on with our infill, our pollution, our deforestation and overfishing.
The time to change course was in the 70s and 80s. People wrote, people spoke, people marched, there were even Environmentalist Radicals/Hard Greens blowing up shit. Nothing changed. Then came the 90s and 00s and people started to wake up. Al Gore ranted about it live. Now here we are, in the 10s and 20s, and all we've seen is the commercialization of environmentalism, cheap feel-good solutions and slogans and actions. We get luxury electric cars instead of electric workhorses, trucks, ships, or planes; we keep putting off total green energy until 2030, 2040, 2050.
It'll always be someone else's fucking problem until mankind has moved up to the poles with their cows, pigs, cats, dogs, hamsters, birbs, sheep, chikkuns, gooble goobers, goats, lambs. Salmon, Tuna, Halibut and other fish squirm in massive aquafarms. Caged off Lions, Hippos, Elephants, Whales, Seals, Apes, Monkeys, Hyenas, Llamas, Tigers, and the like provide some entertainment as being cute megafauna. Some bugs skitter around and the rats remain. Wheat and Soy and Corn and Beans and Barley and Rice and Quinoa cover everything that isn't a city or protected, managed 'forest', which are basically huge, curated parks.
Enjoy Earth: Mankind's first mangled managed colony; where you can probably list off all the remaining species of animals by memory soon enough and a list can catalog all the bugs and fish left, all from the new Polar nations as the tropics and subtropics are cooked into useless desert wastes.