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://w

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-dioxide.html https://www.livescience.com/44330-jurassic-dinosaur-carbon-d...