One of the persistent but debunked claims by the climate alarmism movement is that the recent, modern warm period is "unprecedented warming", meaning there were no precedents in global warming. A friend for instance commented in my fb thread about Earth Hour, "The level of CO2 heats up the Earth's atmosphere and we have record high temperatures. 2015 was a record high then until we got data from 2016 and, 2017 maybe even higher."
Here's a shorter timeframe, past 5,000 years. The "human variable" is at the far right of the chart. How different is it compared to the Medieval warm period? compared to the Roman warm period?