The Earth has had far more carbon in its atmosphere than it does now and life was thriving back then. It's pretty clear that the more CO2 is around the better plants do, and then the better animals do as a result.
Plants do grow more but doesn't necessary mean animals do better. In the age of the dinosaurs, they had way more oxygen in the atmosphere which greatly contributed to the larger size of most insects and the famous dinosaurs that we find remains of.
The carbon they want to reduce is you and me.
The Earth has had far more carbon in its atmosphere than it does now and life was thriving back then. It's pretty clear that the more CO2 is around the better plants do, and then the better animals do as a result.
Plants do grow more but doesn't necessary mean animals do better. In the age of the dinosaurs, they had way more oxygen in the atmosphere which greatly contributed to the larger size of most insects and the famous dinosaurs that we find remains of.