C J Campbell schrieb:

Greenland once was, well, green in the tenth century when Eric the Red
discovered it. Oranges grew in Ireland then. The Medieval Warming Period

The common argument. It's true. But it prooves exactly the opposite of
what you think it does.

The point is, look at the climate then and what the effect of a tiny
change was. And then look at the much bigger climate change now. Now try
to think of the effects to be expected by this big change now when
already such a tiny change then caused oranges to grow in Ireland.

Stefan