Time Magazine: Nathan Chan is the ideal worker for the new green economy. He graduated last year from the California Institute of Technology with a double degree in environmental engineering and English literature. From there he went to Columbia University, where he’s finishing up a master’s in public administration with a focus on the environment. Chan, 23, has interned for the Audubon Society, calculating the venerable nonprofit’s carbon footprint, and he’s probably forgotten more math and science than …