(S (S (BASENP (DT The) (NNP Ecological) (NNP Footprint)) (VP (VBZ measures) (NP (NP (BASENP (DT the) (NN area)) (PP (IN of) (NP (ADJP (RB biologically) (JJ productive)) (BASENP (NN land) (CC and) (NN sea))))) (VP (VBN required) (S (VP (TO to) (VP (VB sustian) (BASENP (NN humanity))))))))) (PERIOD .))