Agence France-Presse: Indian and German scientists have said that a controversial experiment has “dampened hopes” that dumping hundreds of tonnes of dissolved iron in the Southern Ocean can lessen global warming. The experiment involved “fertilising” a 300-square-kilometre (115-sqare-mile) area of ocean inside the core of an eddy — an immense rotating column of water — with six tonnes of dissolved iron. As expected, this stimulated growth of tiny planktonic algae or phytoplankton, which it was …