Until recently, the world's energy demands were met almost entirely through the use of fossil fuels: wood, coal, petroleum, and natural gas.
不久之前还几乎全靠木头，煤炭，石油，天然气等化石燃料来满足全人类对能量的需求。
2
Coal, petroleum, insurance and steel were among those that fell most steeply.
煤炭、石油、保险、钢铁等板块跌幅居前。
3
Large scale biotechnology will compete with petroleum and coal to supply the primary sources of organic compounds for fuels and high tonnage industrial products.