720
and the rule explicated so:
(i.imgur.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Coal is trees
Oil is plankton
This is mostly accurate, and I'm glad there will likely be people here who see this and learn something from it. However, it should also be understood that this isn't an indictment of the piece, since strict scientific accuracy was likely not one of the author's goals.
It's whimsical, Leland.