[单项选择]

In their darker moments, climatologists talk about their own "nightmare scenario". This is one where global warming has caused such significant climatic changes that ocean currents change direction. One scene from tile nightmare has the Gulf Stream moving south or even going into reverse, making winter in London look and feel like a St Petersburg January.
The ocean is a great moderating influence on the planet, soaking up heat around the tropics and depositing it in the cooler polar regions. Yet scientists know surprisingly little about how the sea does this— they estimate that the North Atlantic alone moves energy equivalent to the output of several hundred million power stations.
Last year oceanographers began their biggest international research initiative to learn more about ocean circulation. The first results from the World Ocean Circulation Experiment demonstrate just how complex the movement of sea-water can be. They have also given scienti
A. It will enable scientists of the future to prevent extreme climatic changes.
B. It will help scientists predict climate changes.
C. It unites a large number of different countries.
D. It will help dissipate the climatologists’ "nightmare scenario".

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