The transportation industry has a massive impact on the environment, largely because it’s collectively responsible for burning most of the world’s petroleum and creating carbon dioxide emissions. Last fall, French manufacturer Alstom demonstrated the Coradia iLint, a zero-emissions train that is carbon-neutral, but in a way you probably wouldn’t expect. The train requires a hydrogen tank and a fuel cell, but the hydrogen it uses is a waste product created by the chemical industry. By relying on a substance that’s otherwise useless, the train doesn’t place an additional burden on the environment. The train will permanently take passengers on the German Buxtehude/Bremervörde/Bremerhaven/Cuxhaven route beginning in 2018.