Business Green: Shell has today taken a major step towards completing its long-awaited $12bn (£7.7bn) deal with Brazilian ethanol giant Cosan, which should see the two companies team up to create one of the world’s largest biofuel firms. The companies announced that they have signed binding agreements to create the new joint venture, which was first proposed in February. The planned venture still requires regulatory approval, but it looks increasingly likely that the new firm will emerge as a …