The main gas produced by anaerobic decomposition of organic waste in a sanitary landfill, which must be collected and used or flared, is

A $CH X_{4}$
B $O X_{2}$
C $SO X_{3}$
D $N X_{2} O X_{5}$

Answer: A

Anaerobic bacteria convert organic matter to methane and carbon dioxide. Methane is flammable and a greenhouse gas, so landfills have gas collection systems.

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