Green Steel
Conventional steel production releases about two tons of carbon dioxide into the atmosphere for every ton of steel it produces, causing up to somewhere between 7-8% of mankind's CO2 emissions. The steelmaking process can be completely or partially decarbonized using green hydrogen, both as a power source for electric arc furnaces and as a reductant to replace baked coal.
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The industrial sector is responsible for about 25% of global CO2 emissions – or about 9.3 billion metric tonnes per year and growing. But a team at the University of Leeds says we don't need to wait for magical new tech to clean most of it up.