Coal is still used, mostly in power stations, to cover one-quarter of our energy needs, but it is the least efficient, unhealthiest and most environmentally damaging fossil fuel.

• 煤仍被使用，主要是在发电站，以解决我们四分之一的能源需求。但煤确是最无效率，最不健康，最不环保的矿物燃料。