Utilising the cheap and plentiful coaltar that was an almost unlimited byproduct of London's gas street lighting, the dye works began producing the world's first synthetically dyed material in 1857.
Our known fossil fuel reserves are soaring. New finds of coal, natural gas, oil, tar sands, and oil shale keep growing, not declining.
已知的矿石燃料储备猛涨；不断有新的煤矿、天然气、石油、焦油砂和油页岩被发现；人口数量也在增长。
3
Calcium oxide in circulating ash is favorable to decrease the yield of tar and increase the yield of gas in partial coal gasification process with the circulating fluidized bed technology.