In Iceland's barren landscape, a new container-like structure has risen alongside plumes of steam near the Hellisheidi geothermal power plant. Its job is to undo some of the damage carbon-dioxide (CO2) emissions are causing to the planet. The facility, called Orca and built by Swiss startup Climeworks AG, will suck CO2 out of the air. Icelandic startup Carbfix will then pump it deep into the ground, turning it into stone forever.