London — BHP Group, the world’s biggest mining company, has invested in start-up company Boston Metal seeking to develop less-polluting ways of making steel.

While many in the mining industry have outlined how they plan to curb their own direct pollution, those emissions are a fraction of ones produced by customers, with steelmaking one of the biggest global emitters. Rather than set hard targets to reduce so-called Scope 3 emissions, companies such as Rio Tinto and BHP have committed to working with the steel sector to help develop new technologies instead...

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