What will really matter in the long run? We can’t see the future, but we expect these technologies to affect our world in a big way, for decades to come. Technology Review

Making steel is one of the largest industrial sources of carbon dioxide, emitting more carbon than all of India (the world’s third largest emitter) and far more than air travel. The first industrial green-steel plant, which uses hydrogen made with renewable power, is being built by Stegra, a $7 billion startup that is scheduled to begin operations 2026 in northern Sweden. Technology Review