Frederick Hewett is a Cambridge-based freelance writer and a frequent contributor to Cognoscenti. He writes about climate and energy. His organizational affiliations and volunteer interests include 350 Massachusetts, ThirdAct.org, Charles River Watershed Association, Community Rowing, Harvard Institute for Learning in Retirement, Cambridge Rindge and Latin School, and the Charles River Conservancy. He was a software engineer for three decades and is often seen rowing a single scull on the Charles.