According to the passage, global warming and climate change might cause

A．warn people of the danger of global warming.
B．arouse people’s sympathy for the islanders in the Pacific.
C．blame those nations which let out greenhouse gas emissions.
D．call for a donation to the residents in the Pacific islands.

A．global warming is not only a theoretical problem but also a practical one.
B．there is a great difference between the rich and poor.
C．science discussion has nothing to do with the practical problem.
D．well-qualified doctors know little about the reality of the problem.