A Ses­sion of the Sus­tain­able Devel­op­ment and Envi­ron­men­tal Eco­nom­ics Sem­i­nar is held in  Paris on Tues­day, Sep­tem­ber 30, 2014. It is enti­tled “Bio­di­ver­sity Off­set­ting and sus­tain­able devel­op­ment: a right to destroy, a fool’s bar­gain or a tool for reconciliation?”