1/16 of a Second.

I saw a recent documentary in which the earth’s history was represented by a 24-hour clock. If the planet is at Midnight now, bacteria have filled the planet with oxygen since 8:00 this morning. The dinosaurs came on the scene around 9:30 pm. Humans entered about 30 seconds ago. By this scale, I figure we polluted the planet in the last 1/16 of a second.