The way it was done in 1970 required the harvesting, processing and combustion of three billion metric tons of coal and lignite,17 billion barrels of oil, more than a trillion cubic meters of natural gas and perhaps two billion cubic meters of fuelwood.

• 按照70年的能源供应，需要开采、加工和燃烧30亿公吨的煤和褐煤，170亿桶的石油，一万多亿立方米的天然气和大约20亿立方米的木柴。