What a crock.
An 1800 foot long asteroid is not massive.
1 in 1000 chance of hitting Earth is pretty slim.
Mass extinctions? No way.
Junk science.
Do you have any idea of the energy that would be generated by an object that size traveling at MACH-5 or so? If it hits anywhere on the American Continent, you might finally cash in on that Kansas beach-front property!