Oh, we've been steadily working to destroy the planet ever since we invented the spear and the plow, honestly. Medieval cities had problems with smoke and ash everywhere, and sewage was never very efficient. Ancient hunter-gatherers hunted some large prey species to extinction by chasing them off cliffs.

[Mental shrug.]

We're only at the point in my time where there are enough of us and our technology is advanced enough that we're destroying more than just our local ecosystem, that's all.

[And he'll have to look for this Alexander Hamilton. He's pretty sure the wig would be accurate, since the dollar bill portrait is based on paintings at the time. Maybe prettier, considering who was paying for those paintings, but still.]