When student activist Chloe Maxmin graduated from Harvard University in 2015, many of her classmates went on to lucrative jobs in big coastal cities. But Maxmin, who devoted much of her time on campus to a fossil-fuel divestment campaign that she co-founded, chose a different path. The native of Nobleboro, Maine (population 1,643), returned to her home state to work as a grass-roots organizer.