We have other ways of figuring out historical CO2 levels. Artctic and Antarctic ice for example. It’s pretty clear that at least from the start of human societies to now, CO2 has never been higher, so we’re in uncharted territory as far as our species and way of life is concerned.
We have other ways of figuring out historical CO2 levels. Artctic and Antarctic ice for example. It’s pretty clear that at least from the start of human societies to now, CO2 has never been higher, so we’re in uncharted territory as far as our species and way of life is concerned.