Here's a related question: Supposedly now the CO2 concentration is about 400 parts per million (maybe by weight) and up from ballpark 200. Okay, how much CO2

Here's a related question: Supposedly now the CO2 concentration is about 400 parts per million (maybe by weight) and up from ballpark 200. Okay, how much CO2 is 200 parts per million in the atmosphere? Then, how does that much CO2 compare with what comes from human activity? Or, over a time interval while CO2 concentration increases by, say, 1 part per million, how much CO2 was generated during that time interval? Why? (1) The atmosphere is a biggie thing, and maybe CO2 from human activity is tiny in comparison, too small to represent increasing CO2 concentration by 200 parts per million. Need some numbers to know. (2)There are claims that CO2 emitted into the atmosphere by human activity is tiny compared with that from volcanoes and rotting vegetation. If so, then we have to ask where the CO2 for the increased concentration is coming from? From the oceans as they slowly warm from the cooling of the Little Ice Age? My point about the cooling of the Little Ice Age was that it was likely not caused by reductions in CO2 from human activity. Indeed, as the climate cooled, humans had one heck of an incentive to burn all the firewood they could find. So, the Little Ice Age seems to be a case where there was drop in temperature without a drop in CO2 from human activity. If so, then there have to be some causes of temperature change other than changes in the rate of CO2 emissions from human activity. That is, apparently there would be climate change even without humans.