a PIONEERING GBP1 billion climate- change project in Scotland's biggest power station has been scrapped amid escalating costs, it has been confirmed.  The carbon capture and storage (CCS) scheme at Longannet coal-fired power station, in Fife, was to be the first of its kind in the UK, with the ability to trap harmful greenhouse gas emissions from the plant.  The decision came under fire from environmental groups and First Minister alex Salmond, who said it was an "enormous lost opportunity".  Dr Richard Dixon, director of environmental charity WWF Scotland, added: "This news is massively disappointing and threatens Scotland's - and the rest of the UK's - ambition to be at the forefront of developing this new technology.  "If technical and economic hurdles can be overcome, CCS has the potential to help reduce emissions at thousands of coal-power stations around the world.  "However, almost four years after launching its funding competition, plans for CCS in the UK have descended into farce.  "Four years have effectively been wasted in the battle to tackle climate change. "  UK Energy and Climate Change Secretary Chris Huhne told MPs yesterday there were "specific problems" with the Longannet scheme over the leng