You've probably noticed that the up/down vote numbers have suddenly turned very strange in the past few hours, with everything being downvoted below zero. This is because /r/worldnews is under attack. The source of the downvoting is currently unknown but we and the admins are investigating and doing our best to find out.
The purpose of this attack is to disrupt the subreddit. It does this by delivering enough downvotes to render posts invisible by reddit's default settings, and to discourage your participating by downvoting everything below zero.