Via a reader tip, Fox 5 reports that Greenpeace has taken responsibility for the polar bears that have been mistaken for suspicious packages around town over the last week. Indeed, if you go to the Greenpeace homepage, it turns out that not only was Greenpeace responsible, but they actually did it in collaboration with street artist Mark Jenkins -- so both of our guesses were correct! Greenpeace has unveiled a collaborative art project with well-known......