ClimateWire: When you get Klaus Lackner, a scientist at Columbia University, talking about his work, he sounds a bit like a traveling salesman. His product seems at first to be infeasible, but as he describes it, it moves to the feasible and then to a must-have item. Ten years ago, no one, Lackner included, really believed it could be possible to efficiently capture and remove carbon dioxide directly from the atmosphere. Today, the idea is still widely considered a far-fetched option for …