and yet CO2 concentrations during the Jurassic were 5X higher than they are today. be careful of government agencies and NGOs who publish such misleading graphs as the one you copied from NOAA. That entire period, except for the last 10,000 years or so, was during the last Great Ice Age (the Pleistocene), which started about 2.5 million years ago and ended relatively recently I recall early January of 2017, might even have been New Year's Day edition of the New York Slimes talking about how 2016 was the 'warmest year on record.' What they failed to tell their readers was that 2016 was warmer than 2015 by 0.1º, when the margin of error was +/- 0.5º. IOW, the guy who wrote that article is either a moron or a liar. But it was in the NYT, so it *must* be true. I still remember reading at wikileaks the emails hacked from the mail servers at University of East Anglia (the center of climate change "research" ) back in 2010 or so. It couldn't be clearer from those emails that their MO was to lie, lie, lie, and actively suppress any research which contradicted their lies.