BBC: The Bishop of Oxford would like people to reduce their carbon footprint during the 40 days of Lent by taking part in a carbon fast. Lent, which begins today, is a Christian festival and is traditionally a time for fasting. Abstaining from chocolate and alcohol are popular choices for people marking the event. The Right Reverend John Pritchard, Bishop of Oxford, said people should cut their carbon emissions instead. “The impact of our changing climate can sometimes …