Most people think of ammonia as a household cleaner. To big oil companies, climate investors and the U.S. government, it is a hot commodity that is attracting billions of dollars for its use in fertilizer and low-carbon energy.
Ammonia, which is a mixture of hydrogen and nitrogen, has long been a critical ingredient in fertilizer, but it is also a big emitter of greenhouse gases because it is typically made using fossil fuels. Projects like the one in Indiana are considered low-carbon because they trap the CO2 emissions from the process and bury them underground.