A worker seen with a face mask next to nickel bags at the PT...

SOROWAKO, SOUTH SULAWESI, INDONESIA - 2019/03/28: A worker seen with a face mask next to nickel bags at the PT Vale Indonesia nickel plant. Nickel mining by the PT Vale Indonesia, a nickel plant in Soroako, South Sulawesi, Indonesia. A number of economists and observers predict an increase in demand for nickel in future, one of the reasons is the era of electric vehicles where nickel is a raw material for its batteries. (Photo by Hariandi Hafid/SOPA Images/LightRocket via Getty Images)