Q32:
Proposal: Carbon dioxide and methane in the atmosphere block the
escape of heat into space. So emission of these “greenhouse”
gases contributes to global warming. In order to reduce global
warming, emission of greenhouse gases needs to be reduced.
Therefore, the methane now emitted from open landfills should
instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is
released into the atmosphere.
Which of the following, if true, most adequately counters the
objection made to the proposal?
Every time a human being or other mammal exhales, there is some
carbon dioxide released into the air.
The conversion of methane to electricity would occur at a
considerable distance from the landfills.
The methane that is used to generate electricity would generally be
used as a substitute for a fuel that does not produce any
greenhouse gases when burned.
Methane in the atmosphere is more effective in blocking the escape
of heat from the Earth than is carbon dioxide.
The amount of methane emitted from the landfills could be reduced
if the materials whose decomposition produces methane were not
discarded, but recycled.
为什么选D而不选C，好像E也比D好呀? | 
