关于科学~就一道题~急急急~。。。

In contrast, cooler sea temperatures, high atmospheric pressure and drier air characterize the La Niña phase of the Southern Oscillation. During La Niña, currents bring nutrients up from the deep water, providing feast, rather than famine, for marine organisms. And accompanying strong winds blow moisture away, making for cloudless skies and dry conditions in equatorial countries from the International Date Line east to South America.

Some scientists believe that the increased intensity and frequency—now every two to three years—of El Niño and La Niña events in recent decades is due to warmer ocean temperatures resulting from global warming. In a 1998 report, scientists from NOAA explained that higher global temperatures might be increasing evaporation from land and adding moisture to the air, thus intensifying the storms and floods associated with El Niño.

Another take on what's happening is from Kevin Trenberth, a clima