More than two decades ago, physicist Klaus Lackner was among the first to explore the idea of technologies that could capture carbon dioxide from the atmosphere to reduce the buildup of greenhouse gases contributing to the rise in global warming and its environmental threat. Today, as a Fulton Schools professor and director of ASU’s Center for Negative Carbon Emissions, Lackner and his research team are making progress toward safe, scalable and cost-efficient technologies and systems for carbon capture and sequestration. In this interview, Lackner provides a wide-ranging look at the potential of these advances to clean up our air and the challenges of pursuing that goal effectively and broadly enough to make a sustainable impact on the quality of the planet’s environment.