Photo by Petri Tuohimaa for GMRI, CC BY-NC-ND “Sarah on a beach near Portland, Maine looking for two species of invasive marine crabs – Carcinus maenas (European green crab) and Hemigrapsus sanguineus (Asian shore crabs).” In April, I had a chance to meet with Sarah Kirn, Program Manager of Vital Signs, a field and inquiry…