Humanity does need energy if we're going to avoid starving in frigid dark, but that energy needn't come from fossil fuels. Indeed, in the long-term, it can't. Even if you're a rootin' tootin, coal-rollin' climate denier, there's a hard-nosed reality you can't deny: keep using fossil fuels, and they'll run out. Remember "peak oil" panic? Fossil fuels are finite, and the future of the human race needn't be. We need more.