( Today ( , ( ( ( ( ( ( ( North America ) , ) Australia ) , ) and ) Antarctica ) ( ( ( are ( ( the ( only continents ) ) not ) ) ( contaminated ( by ( land mines ) ) ) ) . ) ) ) )
(ROOT (S (NP (NN Today)) (, ,) (NP (NP (NNP North) (NNP America)) (, ,) (NP (NNP Australia)) (, ,) (CC and) (NP (NNP Antarctica))) (VP (VBP are) (ADVP (NP (DT the) (JJ only) (NNS continents)) (RB not)) (VP (VBN contaminated) (PP (IN by) (NP (NN land) (NNS mines))))) (. .)))
Today, North America, Australia, and Antarctica are the only continents not contaminated by land mines.
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))