... A lot, according to this newspaper. Because the more worried/stressed/scared you are, the more likely you are to feel you need to care about reading the news every day.
As for how worried you should actually be that you'll get hit by a piece of space debris: zero. You should be zero worried. And you should stop reading scaremongering newspapers like this and go find your information somewhere that is not actively trying to make you feel stressed and scared all the time.
Note: I'm not saying this story is not newsworthy. It is. I'm merely commenting on the awful writing style used in this article. Murdoch is to blame, no doubt.