( ( The footprints ) ( ( are ( best ( viewed ( as ( ` ( ( ( ecological snapshots ) ' ) ( of ( ( resource use ) ( in time ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS footprints)) (VP (VBP are) (VP (RBS best) (VBN viewed) (PP (IN as) (NP (`` `) (NP (JJ ecological) (NNS snapshots)) ('' ') (PP (IN of) (NP (NP (NN resource) (NN use)) (PP (IN in) (NP (NN time))))))))) (. .)))
The footprints are best viewed as 'ecological snapshots' of resource use in time.
(ROOT (S (NP (NP (NNP High)) (PP (IN per) (NP (NP (NN capita) (NN use)) (PP (IN of) (NP (NNS resources)))))) (VP (VBZ means) (SBAR (S (NP (NP (DT the) (JJ ecological) (NN footprint)) (PP (IN of) (NP (DT the) (VBN united) (NNS states)))) (VP (VBZ is) (ADJP (JJ large)))))) (. .)))