Business Green: As Royal Dutch Shell today announced third quarter profits of £6.6bn, environmental groups added their voices to those of Labour backbench MPs and unions calling for a windfall tax on the profits of oil giants to fund investment in carbon emission reduction initiatives. The calls began yesterday after BP announced record profits of £6.4bn incensing MPs such as John Mcdonnell, who branded the results “grotesquely obscene profiteering”. His criticism was echoed today by Friends …