( ( ( ( ( Energy recovery ) ( means ( that ( ( the chemicals ) ( are burned ) ) ) ) ) and ) ( ( energy ( from ( ( the heat ) produced ) ) ) ( is ( used ( for ( some ( other purpose ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Energy) (NN recovery)) (VP (VBZ means) (SBAR (IN that) (S (NP (DT the) (NNS chemicals)) (VP (VBP are) (VP (VBN burned))))))) (CC and) (S (NP (NP (NN energy)) (PP (IN from) (NP (NP (DT the) (NN heat)) (VP (VBN produced))))) (VP (VBZ is) (VP (VBN used) (PP (IN for) (NP (DT some) (JJ other) (NN purpose)))))) (. .)))
Energy recovery means that the chemicals are burned and energy from the heat produced is used for some other purpose.
(ROOT (S (NP (NNP Heat)) (VP (VBZ is) (VP (VBN produced) (SBAR (WHADVP (WRB when)) (S (NP (NN paper)) (VP (VBZ is) (VP (VBN burned))))))) (. .)))
Heat is produced when paper is burned.