Mexico City is sinking so quickly, it can be seen from space

Discussion (220 points,5 days ago, 73 comments) https://news.ycombinator.com/item?id=47974682

Referring to "25 centimeters per year" as "so fast it can be seen from space" is so funny to me.

We have very good satellites! Lots of things can be seen from space. "can be seen from space" is an awful way to provide readers intuition for the scale of something.