Guardian: If Peter Mandelson hoped to make a splash with a speech on the government’s low carbon energy initiatives yesterday, he certainly managed to do so, though perhaps not quite as he intended: an anti-airport protester threw a cupful of green liquid in the business secretary’s face as he arrived outside the Royal Society in central London, and walked away with apparent impunity. News cameras showed Lord Mandelson genially approaching a young woman and then ducking as he was splattered …