(S (S (NP (BASENP (NN Erosion)) (PP (IN in) (BASENP (NNP Nigeria)))) (VP (VBZ has) (VP (VBN lead) (PP (TO to) (S (VP (VBG increasing) (NP (BASENP (NN concern)) (PP (IN on) (NP (BASENP (NN climate) (NN policy)) (PP (IN for) (BASENP (DT the) (JJ entire) (NN country)))))))))))) (PERIOD .))