Maybe in 40 years all the greenhouse gases will make the earths atmosphere more dense and the asteroid will skip off of the atomopshere instead of entering it, had there not been anuy pollution:)
Good idea! Of course even without mans' additions there will still be plenty of pollution from natural fires and volcanoes.
I like the idea above about capturing the asteroid and parking it in earth orbit. That might take a while but it is certainly easier than going out the Belt and floating one to us.
That's a lot of material that we could use on earth especially if it is metals-based.