Looks like it's closest point to the earth will be about 21 million miles. We should be able to see it with binoculars, although it's only about 1-2 miles in diameter. Should have little if no effect at all to the earth.
Unless I am blind and I can't find it on the Sentry Risk Table (http://neo.jpl.nasa.gov/risk/), NASA hasn't even issued a Torino scale category for this object (official name C/2010 X1).
That should mean I don't have any reason to worry. At least no more than normally
In any case, thank you for the link. I don't think the author had a humorous intent in mind when writing it, but I couldn't help but smiling at the last paragraphs. Don't take me wrong, but every month there is a new end-of-the-world prediction (http://www.religioustolerance.org/end_wrld.htm)
Why would it ever? As long as we have knowledge to gain, it must constantly prove to the human species that there truly isn't anything special about us.
Humans are like a flea on an elephant's ass in comparison to the Universe itself. We know little and more than our fair share to still learn. But, that doesn't dismiss what is already learned and/or discovered.