[单项选择]Global warming may or may not be the great environmental crisis of the 21st century, but— regardless of whether it is or isn’t — we won’t do much about it. We will argue over it and may even, as a nation, make some fairly solemn-sounding commitments to avoid it. But the more dramatic and meaningful these commitments seem, the less likely they are to be observed.
A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution. But the real truth is that we don’t know enough to relieve global warming, and — without major technological breakthroughs — we can’t do much about it.
From 2003 to 2050, the world’s population is projected to grow from 6.4 billion to 9.1 billion, a 42% increase. If energy use per person and technology remain the same, total energy use and greenhouse gas emissions(mainly, CO₂) will be 42% higher in 2050. But that’s too low, because societies that grow richer use more energy. We need econom
A. politicians have started to do something to better the situation
B. few nations have adopted real tough measures to limit energy use
C. reductions in energy consumption have greatly cut back global warming
D. international cooperation has contributed to solving environmental problems

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