Compounding effects. Imagine a snowball rolling down the mountain that turns into a basketball sized ball, that into a mountain sized ball, that turns into a

Compounding effects. Imagine a snowball rolling down the mountain that turns into a basketball sized ball, that into a mountain sized ball, that turns into a planet sized ball. There are numerous periods throughout human history where we have almost gone extinct, and several where we have had under 10,000 people worldwide.