Ross and Christophe are joined by Dr. Klaus Lackner, the director of ASU’s Center for Negative Carbon Emissions (CNCE) and professor at the School of Sustainable Engineering. The CNCE is known for advancing carbon management technologies to capture carbon dioxide directly from the air in an outdoor operating environment. Today Klaus explains how he conceived of the windmill-sized structures that could scrub CO2 from the air and how these towers prove to be a more efficient solution than planting trees.