["Widely used, contributes 21% of the world's energy production today.", 'Delivery infrastructure already exists.', 'End use appliances already widespread.', 'Used extensively for power generation as well as heat.', 'Cleanest of all the fossil fuels.', 'Burns quite efficiently.', 'Emits 45% less CO2 than coal.', 'Emits 30% less CO2 than oil.']