It is depressing. But as in Asimov's 'Foundation' novels, even though we cannot stop the dark times, we can ameliorate them. This will require a multi-pronged approach: individuals consuming less, greener approaches to farming that don't involve stripping soil and relying on copious amounts of fertilizer, reducing emissions, setting aside green space ecopreserves, etc.

By working hard towards these goals, we can certainly make life much better for us and our nonhuman companions on this planet and minimize the effects of our growth.

What dead end?

Dinosaurs that roamed the Earth 250 million years ago knew a world with five times more carbon dioxide than is present on Earth today: https://www.livescience.com/44330-jurassic-dinosaur-carbon-d...