Business Green: Eurostar has today announced that it is to upgrade its carbon emission reduction target after increased passenger numbers and a switch of electricity supply for the Channel Tunnel link meant that it has met its goal of reducing emissions by a quarter by 2012 well ahead of schedule. The company’s first sustainability report following the 2007 launch of its Tread Lightly initiative, confirmed emissions per passenger had been cut by 31 per cent against its 2007 base line largely as a …