Industrial metals, liquefied natural gas and steel finished 2017 in stunning fashion as a crackdown on pollution in China, the world’s no. 2 economy, boosts demand for cleaner fossil fuels and raw materials vital to clean-tech industries.

Copper and aluminum have risen by almost a third this year to four-year highs in the last trading week of 2017 of $7,312.50 and $2,284.75 a tonne, respectively.