But it turns out there is a less carbon-­intensive alternative: using hydrogen. Unlike coal or natural gas, which release carbon dioxide as a by-product, this process releases water. And if the hydrogen itself is “green,” the climate impact of the entire process will be minimal. HyIron, which has a site in the Namib desert, is one of a handful of companies around the world that are betting green hydrogen can help the $1.8 trillion steel industry clean up its act. In fact, many now openly admit that the process of testing AI, using sets of exam-style questions called benchmarks, is broken.