Business Report: A polar icebreaker, the Polarstern, is reportedly heading for the Antarctic on the chance that the German government gives the go-ahead to the world’s first large-scale experiment to stimulate plankton growth. Germany suspended the project last week, once the vessel had left Cape Town, to allow scientists time to review its effect. The review will determine whether those on board the icebreaker get to toss about 20 tons of iron sulphate into a vast swathe of the Southern …