How can India turn waste and clean energy into fuel to fight air pollution? The answer may lie in biomass, says Michael B. McElroy, the Gilbert Butler Professor of Environmental Studies in the Department of Earth and Planetary Sciences and the Harvard Paulson School of Engineering and Applied Sciences. Prof. McElroy is one of the inaugural recipients of a Mittal Institute Faculty Climate Grant for his project, “Optimizing India’s Biofuel Capacity with Green Hydrogen Penetration: A Decarbonization and Emission Reduction Strategy.”