It's all about when you start the measurements.

Geologist, Professor Ian Plimer: "We have been cooling down for the last 4000 years. It's all about when you start the measurements. If you take measurements from the Medieval Warming, we've cooled about five degrees since then. If you take measurements from the Roman Warming, we've cooled about five degrees."

Full talk: https://www.youtube.com/watch?v=txQcX0fm5bs
Via @WideAwakeMedia