The CO2 level is around 415 ppm.
But how far back before the year 2000 was it about this level?
3,000,000 years ago!
How high was the Sea Level then?
65 feet higher!
Of course then the CO2 was coming down very, very slowly, like 1 ppm every 10,000 years. Now we are going up at 3 ppm per...