Even if scientists did discover another reasonable explanation for the warming recorded so far, that would give birth to a difficult question. As Robert Henson puts it: “If some newly discovered factor is to blame for the climate change, then why aren’t carbon dioxide and the other greenhouse gases producing the warming that basic physics tells us they should be?”
The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths – one with human influence and one without. That obviously isn’t possible, and so most scientists are careful not to state human influence as an absolute certainty.
1. In most scientists’ opinion, the global warming is mainly caused by ________.
A. solar activity
B. volcanic activity
C. natural factors
D. human factors
2. The text is developed by ________.
A. giving typical examples
B. following the order of space
C. analyzing a theory and arguing it
D. comparing and finding differences
3. The underline word “identical” in the last paragraph probably means ________.
A. totally different
B. exactly the same
C. extremely important
D. partly independent
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