Researchers assessed the 'criticality ' of 41 metals on the Periodic Table . Criticality looks at which materials will become harder to find , which will have the highest environmental costs and which are irreplaceable . Paper found that supplies of gallium , arsenic and selenium are high-risk . These compounds are needed for circuit boards , batteries and more .
Researchers assessed the 'criticality ' of 62 metals on the Periodic Table . Criticality looks at which materials will become harder to find , which will have the highest environmental costs and which are irreplaceable . Paper found that supplies of gallium , arsenic and selenium are high-risk . These compounds are needed for circuit boards , batteries and more .