Reuters: British businesses are wasting 2.5 billion pounds a year in energy bills swollen by inefficiencies such as draughty windows or leaving lights and computers on, the Carbon Trust said on Tuesday. Racing oil prices have added to the cost of wasted energy but businesses are not responding far enough according to the private, government-funded agency whose mandate is to drive cuts in UK carbon emissions and so help fight climate change. “We’re talking about money that could be saved …