Guardian: “We can’t put all our energy in one barrel,” says the BP billboard poster. The slogan is accompanied by fetching images of green plants, wind turbines and the sun. And BP’s own logo, with its green tagline: Beyond Petroleum. But this is confection. Until 2004, BP was called British Petroleum. And in the real world of business, the giant energy company continues to plunder most of its profits from – and sink the great bulk of its investment into – barrels of oil. Who is it …