Reuters: British households could face big rises in their energy bills under plans to reduce the role of fossil fuels and cut planet-warming greenhouse gas emissions by more than a third by 2020, Britain’s chief climate change adviser said on Monday. Skip related content The Committee on Climate Change said the price hike could push more than 1.7 million houses into fuel poverty, when families spend more than a tenth of their income on energy to keep warm. Warnings of higher fuel bills …