Its purpose is the same as every other organism. To survive. - David Walton

Humans are driven by emotion. Much of our so-called logic is merely the rationalization of choices that make us feel good.

The whole earth is solar powered. The movement of clouds and air and water, the growth of plants and animals, it’s all just a big heat engine driven by the sun. Humanity has spent so long binging on fossil fuels that we’ve forgotten where it all comes from.

"If not, we'll go to plan B."
"Which is?"
"I don't know. I'll make it up if we need it."