But it didn't get colder or warmer because of the CO2. The GHG effect of CO2 is relatively weak. The CO2 rose and fell because the planet got colder and warmer. The CO2 reinforced the temperature change. It didn't drive it.I am watching on Netflix a new docuseries on "life on our Planet". About 2 billion years ago, before the Earth had land animals, a great Ice Age happened where all the CO2 was gone, not able to trap the heat of the sun, so all the water that was shallow, froze over, and only the deep oceans were able to continue with life. So my question was, "Where did all the CO2 go"? Then when the CO2 came back, (No man was on Earth at the time) the ice melted and soon life came out of the sea. So where did the CO2 come back from? Not man, but a cycle of the Earth that keeps happening. So thanks to the docuseries, this proves the lies of the Marxists who wants to steal the wealth of America.