What Should We be Worried About?

Max Tegmark writes a very thought-provoking short essay entitled “Life As We Know It”. I suggest reading the whole thing if you’re after some inspiration and food for thought on this cloudy Tuesday. Here’s a taste:

As our "Spaceship Earth" blazes though cold and barren space, it both sustains and protects us. It's stocked with major but limited supplies of water, food and fuel. Its atmosphere keeps us warm and shielded from the Sun's harmful ultraviolet rays, and its magnetic field shelters us from lethal cosmic rays. Surely any responsible spaceship captain would make it a top priority to safeguard its future existence by avoiding asteroid collisions, on-board explosions, overheating, ultraviolet shield destruction, and premature depletion of supplies? Yet our spaceship crew hasn't made any of these issues a top priority, devoting (by my estimate) less than a millionth of its resources to them. In fact, our spaceship doesn't even have a captain!