Systems being developed to remove carbon dioxide from the atmosphere are very expensive, but may also become very necessary if we are to maintain a livable environment on Earth. Every year, human activity is releasing much of the more than 35 gigatons of carbon dioxide going into the air, resulting in more massive accumulations of greenhouse gasses that are ratcheting up globing warming and its potentially dire consequences for the planet. Among emerging solutions are carbon capture systems such as those be created by ASU’s Center for Negative Carbon Emissions, directed by Fulton Schools Professor Klaus Lackner. Progress by his research team is increasing the viability of technologies designed to clean the skies of the threatening gasses.