Only if you believe in infinite resources.
Aside from the basic sanity check another way to determine if it's exponential (Assuming for instance that someone didn't know the Earth was finite) is just running
the numbers, which is a much better indicator than just looking at a graph since it's fairly common practice to
screw w/ statistics in order to push some sort of agenduh. For instance in the few articles I've read from 'em, the Heritage Foundation seems to be extremely fond of misdirection in the context of some supposedly relevant but actually moot statistic.