For decades environmentalists have told us that using fossil fuels is a self-destructive addiction that will destroy our planet. Yet by every measure of human well-being, from life expectancy to clean water to climate safety, life has been getting better and better. How can this be? The explanation is that we usually hear only one side of the story. We're taught to think only of the negatives of fossil fuels, their risks and side effects, but not their positives.