(after Marianne Moore’s “The Camperdown Elm”) by Marcella Durand Dear Mayor Bill de Blasio, I choose as my treean oak that standssomewhat alonein a triangular lawn-like spacefacing the East Riverin East River Park,which is slatedto be demolishedthis coming Septemberper your opaque and confusingplans to, at some point,protect the Lower East Sidefrom floodingduring superstorms. The oak…