( ( As ( the ( waste stabilises ) ) ) ( , ( ( methane production ) ( ( will reduce ) . ) ) ) )
(ROOT (S (PP (IN As) (NP (DT the) (NN waste) (NNS stabilises))) (, ,) (NP (NN methane) (NN production)) (VP (MD will) (VP (VB reduce))) (. .)))
As the waste stabilises, methane production will reduce.
(ROOT (S (NP (NNS Archaeans)) (VP (VBP produce) (NP (NN methane) (NN gas)) (PP (IN as) (NP (DT a) (NN waste) (NN product)))) (. .)))