( ( ( All forms ) ( of ( fossil ( fuel energy ) ) ) ) ( ( produce ( heat ( and ( combustion products ) ) ) ) . ) )
(ROOT (S (NP (NP (DT All) (NNS forms)) (PP (IN of) (NP (JJ fossil) (NN fuel) (NN energy)))) (VP (VBP produce) (NP (NN heat) (CC and) (NN combustion) (NNS products))) (. .)))
All forms of fossil fuel energy produce heat and combustion products.
(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.