Aluminum climbed to the highest in more than a decade after a coup in Guinea fueled concerns over raw material supplies.

Guinea is a key global supplier of bauxite, an ore that’s processed into alumina and then aluminum.

Several Chinese regions have imposed restrictions in recent months because of tight power supplies and pressure to reduce emissions.

History has shown that if Beijing feels the economy is losing too much steam, the stimulus taps will be re-opened.

Country released another 150,000 tonnes of state metal inventories to the market on Wednesday.

The world needs more aluminum to go green but the smelters that produce the stuff account for around 2% of all man-made emissions each year.

The producers face severe disruption if smelters experience outages and have few alternatives to domestic coal.

Aluminum has climbed as major economies recover from the pandemic. Futures in London are up almost 35% in 2021 to $2,650 a tonne, the highest in around a decade.