[realo]

Yes... why!!

Let's go back... ah, I see mile-high glaciers over London.

Global warming did occur in the past as well.

[graemep]

How is that a reason to exclude it from the graph? Surely including it in the charts would strengthen the case for regarding it as a long term problem?

Excluding it subtly suggests that global warming is a short term phenomenon.

[tasuki]

I agree with you that it's a long term problem. I won't stop until London is under a mile-high glacier!

[hdgvhicv]

There you go

https://xkcd.com/1732/

20,000 years enough?