Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living
in the guts of cattle, and beef production is
increasing.
B. methane is generated by archaeons living
in waterlogged rice paddies, and rice
production is increasing.
C. methane is released when permafrost at
high latitudes melts, and more permafrost is
melting.
D. methane is generated by archaeons living
in the guts of cattle and in rice paddies, and
both beef and rice production are increasing.
E. All of the above.
E
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A. true B. false
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