When I talk to people about my research, I have found that it is not usually very helpful to say that I am an organometallic chemist or (worse) to say that I synthesize carbon dioxide complexes of molybdenum and tungsten. Instead, I usually start by talking about trees. Most people know about photosynthesis and that a tree, like all plants, harnesses the energy from light to grow. Some people even know that the whole body of the tree: its leaves, trunk, roots and all its branches are made primarily of carbon. Where does the tree get all of this carbon? From the air. The tree uses the energy it collects…