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Citi Finds Surprising Path to Consider Polluting Metals as Green

Photographer: Cole Burston/Bloomberg
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Metals -- even the dirtiest old-world varieties like steel -- can already be considered green if their contribution to climate change mitigation is taken into account, according to a Citigroup Inc. report.

Contrary to conventional wisdom, analysts including Max Layton found that metals like copper, nickel, aluminum and steel can drive down global-warming gases given how much of them will be used to build the wind turbines, electric vehicles and carbon capture technologies needed to electrify economies.