Thoughts on Earth Day, or A Travel Brochure for Earth

Credit: NASA

A few weeks ago, on a beautiful day, I went for a jog through a nearby park and started thinking about what a nice planet we are so lucky to live on. Our nearest neighbors are a stormy, roiling furnace and a frigid, vacuous desert. The latest survey has found that there are a lot of planets out there, a lot of them may be habitable as well (capable of sustaining liquid water), but still, planets like Earth don't just show up everywhere.

Last year, astrophysicist Stephen Hawking made a mildly provocative statement that there is almost certainly intelligent life out there besides ourselves, but that it would be a mistake to try to contact them. Given what a rare oasis our planet is, maybe Hawking is correct in apparently believing that the plot of Independence Day is the most likely outcome. Hawking bases this on the idea that intelligent, space-faring species will probably act a lot like us. But then, it's not inconceivable that they might come to Earth just to take pictures, talk loudly about how inferior our customs are, and leave lousy tips. As annoying as this might be, interstellar tourism would be a boon to the global economy, which would certainly make people more concerned about conserving our planet's ecosystems.

So what sorts of things might be in a travel guide for Earth?