Since modern temperature measurements did not start until 1880 I am not sure what we can now observe is anything to really get worried about. 

We are so worried about CO2 and yet it appears that it has been at this level at other times in the past. If you wish to believe that the earth is millions of years old that is fine it fits with the article. Maybe some of the more knowledgeable experts here can explain what was producing the CO2 back then. Doubt is was fossils fuels being burned in ICE vehicles.

 Finally, the team looked at records from two past climates—20,000 years ago, at the peak of the last ice age, and a warm period 3 million years ago, the last time atmospheric CO2 levels were similar to today's. Recent work suggests climate sensitivity is not a fixed property of the planet, but changes over time. During warm periods, for instance, the absence of ice sheets probably raised sensitivity. Records of ancient temperatures and CO2 levels enabled the team to pin down sensitivities of 2.5°C and 3.2°C for the cold and warm periods, respectively. "It's really comprehensive," says Jessica Tierney, a paleoclimatologist at the University of Arizona, who was not part of the report. Even for the coldest climate state, she says, the possibility of a sensitivity below 2°C seems negligible.
https://www.science.org/content/article/after-40-years-researchers-finally-see-earths-climate-destiny-more-clearly