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Sinks for Methane
Sinks for methane include atmospheric removal of about 470 units,
removal by soil of about 30 teragrams, leaving an atmospheric increase of about
32 units. By taking subtotals of natural and anthropogenic sources, it is easy
to see that humans contribute at least as much as natural sources and possible
much more. Such numbers as these are consistent with the observed build-up
of methane in the atmosphere in the last 200 years. (See
Figure 10.)
