Let's send some boosters out there, redirect it to earth, and make a second moon. Come on people, what ever happened to doing shit cause its fuckin' rad, do you know how cool another moon would be?!
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.
Bringing a large celestial body close to Earth would be just as smart as trying to let the aliens know that we are here. (The humanity may not be able to survive either one.)