How so? We've already caused a greater mass extinction than the last ice age did, and it's accelerating. Red blooms are sprouting up in our oceans. Methane and CO2 levels in the atmosphere are increasing at an accelerating rate, too.

All the while, people are getting fatter and fatter, and less and less active. Our great grandparents had to struggle and suffer just to survive. Most of us have never dealt with true scarcity in our lives.

Each generation is getting lazier, more privilaged and more destructive.