The world's first negative emissions plant under the CarbFix Project to turn atmospheric carbon dioxide into stone has begun operations in Hellisheidi, Iceland. The project is intended to lock away carbon-dioxide by reacting with basaltic rocks. The work on the CarbFix Project started in the year 2007. In this project, the carbon dioxide is captured from ambient air, bound to water, and sent to more than 700 meters underground. Currently, the system captures only 50 metric tons of carbon dioxide each year, about the same emitted by a single US household. It pumps the collected gas deep into the island's volcanic bedrock, where it reacts with basalt and essentially turns into limestone.