All of our planet's problems began 10,000 to 15,000 years ago with the domestication of livestock and crops, and it went downhill from there. While agriculture provided a stable food supply, it also required the destruction of pristine land. Surplus food enabled the growth of cities; cities led to civilizations; and civilizations eventually discovered the science and technology that allowed our numbers to grow. And, while these advances have been great for us humans, they haven't been so great for the natural world. We have taken from nature and left our amassing waste in the land, oceans, and air -- poisoning our planet.