[hirundo]

Constructive interference from multiple tidal waves could flood huge coastal areas, killing or displacing millions. Uncool.

[015a]

Then again, global warming is going to flood huge coastal areas, killing or displacing millions, which is a pretty uncool thing we're doing to ourselves, so maybe Second Moon will counter-act that? There's literally no way of knowing until we try. And worst case scenario, we ruin a bunch of earth and we've got a second moon to move to. Its a win-win.

[jazzyjackson]

Put it in orbit at a 90 degree angle from the moon with Earth as the center and you can cause destructive interference and lower the tides :)

[dylan604]

Or very cool if you're an evil villain in a movie/comic. Give me one milllllion dollars, or I will bring in a second moon!