Guardian: Shell, I have to report, is the new Exxon. The company that back in December was filling this and other newspapers with double-page adverts promoting its conversion to a “new energy future” of wind farms, hydrogen fuels, fuel made from marine algae and much else, has pulled the plug. In the 1990s Royal Dutch Shell set its boffins on finding new green fuels, such as forest plantations to make biofuels. I remember them at the Earth Summit in Rio back in 1992. Not long after, Shell was …