Natural gas, coal, frac water, and ignorance
You and I use a lot of energy. Every second of each day and night we devour 100 times more energy than we need to live. If I were to eat that much energy as food, I would be a 50-foot long bull sperm whale, weighing 40 tons. There are 300,000 sperm whales worldwide, half of them bulls (females are much smaller), and 300,000,000 Americans (females are about the same in size). Our Earth cannot feed and protect 300,000,000 male sperm whales. She is simply too small.
Our voracious appetite for energy must be either extinguished or quenched with local sources of energy (and, no, wind turbines and PV cells are too small to provide even a single ample energy meal per day).