CNN: There’s a new wave of horror films stalking the box office. Master of modern horror? Al Gore’s ‘An Inconvenient Truth’ presented eco-disaster as both shocking and a call-to-arms. You can forget the torture porn of “Saw” and “Hostel” – in fact these new films are marked by a distinct lack of blood and guts. But there is no doubting their ability to chill audiences to the core: Welcome to the world of eco-horror. Unlike most horror films these movies aren’t fiction, they …