( ( ( Environmental Aspects ) ( of ( Geothermal ( Energy ( Use ( Geothermal energy ) ) ) ) ) ) ( ( ( does not ) ( require ( fuel-burning ( to ( produce ( ( heat or ) electricity ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Environmental) (NNP Aspects)) (PP (IN of) (NP (NNP Geothermal) (NNP Energy) (NNP Use) (NNP Geothermal) (NN energy)))) (VP (VBZ does) (RB not) (VP (VB require) (ADJP (JJ fuel-burning) (S (VP (TO to) (VP (VB produce) (NP (NN heat) (CC or) (NN electricity)))))))) (. .)))
Environmental Aspects of Geothermal Energy Use Geothermal energy does not require fuel-burning to produce heat or electricity.
(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.