NASA has a pretty good website describing climate change. This graphic shows the rise of CO2 in the earth’s atmosphere over 650,000 years. There are natural variations and cycles, which has caused climate to change over time. Those peaks and dips correspond with hot, normal, and cool periods over thousands of years, for example. But never before has there been an event like the one we are causing today. This spike in CO2 and other emissions has never happened in earth’s history.
Longtime followers know that - based on the evidence (i.e., first line, page 4) - it’s nearly impossible to stop or reverse this rise. So, I suppose, NASA’s page is a real-time recording of impending doom.