if you get a global warmer on, suggest that they read Danziger's 1215 - (which is a very interesting read with insights to how society lived and was structured at the time of 1215 - religion, politics, punishments, law, food, drink and sex.....etc etc.
One thing comes out - in 1215 England's drink culture was wine - upto Luton had the current clime of Bordeaux as it was on average 4C (if I remember) warmer than now and they were growing white wine grapes up into Scotland....... Then the mini-ice age of the late 15th and 16thC took over (and one can plot mini-moraines in Scotland on where the glaciers came about and Snowdonia was named as the Welsh Alps) - then we became a grain based society for beers and whiskies. Germany etc also followed this vino-climatic change......
In short, global change has always been around - not that I am condoning the wastage of resources and belching things like NOx-es and SOx-es into the atmosphere.......