weighing just 780 grammes, can deliver enough energy to cover all your lifetime use, including electricity, car driving, jet flights, food and manufactured goods – a total of 6.4 million kWh. To get the same energy output from coal would require 3,200 tonnes of black rock, a mass equivalent to 800 adult elephants and resulting in more than 11,000 tonnes of carbon dioxide.[26] The volume of this pile of coal would be 4,000 cubic metres: you can imagine it as a cube 16 metres in height, depth and width, about the size of a large 5-story building.
