( ( ( An ( important reason ) ) ( for this ) ) ( ( is ( that ( ( only ( very ( few Americans ) ) ) ( have ( ( been ( aware ( of ( ( the introduction ) ( of GMOs ) ) ) ) ) ( into ( ( the ( food chain ) ) ( of ( mainstream America ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (JJ important) (NN reason)) (PP (IN for) (NP (DT this)))) (VP (VBZ is) (SBAR (IN that) (S (NP (RB only) (RB very) (JJ few) (NNS Americans)) (VP (VBP have) (VP (VBN been) (ADJP (JJ aware) (PP (IN of) (NP (NP (DT the) (NN introduction)) (PP (IN of) (NP (NNP GMOs)))))) (PP (IN into) (NP (NP (DT the) (NN food) (NN chain)) (PP (IN of) (NP (NNP mainstream) (NNP America)))))))))) (. .)))
An important reason for this is that only very few Americans have been aware of the introduction of GMOs into the food chain of mainstream America.
(ROOT (S (NP (NP (NN Loss)) (PP (IN of) (NP (NN energy)))) (VP (VBZ is) (NP (DT the) (NN reason)) (SBAR (IN that) (S (NP (NN food) (NN chain)) (ADVP (RB typically)) (VP (VBZ has) (NP (JJ few) (NNS levels)))))) (. .)))