Maybe you’ve never thought about it, but we are living on a spaceship called Earth. It’s a big one, with more than 7 billion people on board, traveling at about 108,000 Km/h (67,500 mph) in the solar system, while spinning in such a way that, if you are on the equator line, you are moving at more than 1,700 Km/h (1,000 mph). Amazing, isn’t it?
In our travel through the universe, we are protected from outer space by our pressurized canopy: a 12 Km-thick barrier limited by an ozone layer that acts as a shield against radiation and small asteroids. It also allows us to breathe fresh air. It’s a very complex ship, with systems designed to provide the passengers (us) with anything we need to have a very pleasant journey: food, energy, water and fun. But it was designed 4.5 billion years ago, and there were no human beings at that time asking for so much energy to cool down their houses in summer, heat them up in winter, drive a big car, fly in a plane, or produce goods.