题目内容：
Which of the following is the near explanation of Nakicenovic's assertion that "... such a switch would be disastrous ..."?
A．The 1PCC scenarios would come true because burning coal will emit larger amounts of CO2. B．A switch to burning coal would produce disastrous environmental problems.
C．Oil and gas to replace coal as fuel would speed up the process of global warming.
D．A switch from the IPCC scenarios to the policymakers' ones would be disastrous.
参考答案：
答案解析：