Oh, a “bring back the dinosaurs” comment. Lovely.
For lurkers — the sun was fainter way back when CO2 was much higher than today. The land masses were very different as well. If you are angling for CO2 in the ‘000s, be prepared for an even faster 6th major extinction. And be prepared for vast areas of land being uninhabitable by mammals (including humans). We are tolerant of a wide range of temperatures, but not that wide. Approaching 7C of warming and it won’t just be shrinking coastlines, you’re descendants will find a lot of areas will be too hot and humid to live in. It will kill them.