The demonstration at Britain's largest coal-fired power station in North Yorkshire has put the spotlight on carbon emissions and is proving a challenge to police...When they arrived here a week ago, the protesters said they would attempt to close Drax Power Station down and that is what they have been trying to do...Their aim is to heighten awareness of coal-fired power stations, energy consumption and the polluting effects of coal when it is burned in a power station...The company says it is working with government and European agencies to reduce carbon content, but can't have people running around the plant trying to stop production. That would be against their interests, those of the protesters and power consumers, it adds.