Climate change could get worse rapidly if huge amounts of extra heat absorbed by the oceans are released back to the air. New research has shown that oceans have helped mitigate the effects of global warming since the year 2000. Heat trapping gases are being emitted into the atmosphere faster than ever and the ten hottest years have all taken place since 1998. But the rate at which earth’s surface is heating up has slowed down somewhat since 2000, causing scientists to seek an explanation for the phenomenon.
The oceans have taken up more warmth from the air since 2000.This explains the slowdown in surface warming but this pause may be only brief. Most of the excesses in energy was absorbed in the top seven hundred meters of the iocean at the onset of the warming pause , sixty-five per cent of it in the tropical Pacific and Atlantic oceans. The hidden heat , however, may return to the atmosphere stoking warming again. If it is only related to natural variability , then the rate of warming will increase soon . Heat absorbed by the ocean will come back into the atmosphere , if it is a part an ocean cycle such as the ‘El Nino’ warming and ‘La Nina’ cooling events in the Pacific .
The pace of climate change has big economic implications since almost two hundred governments agreed in 2010, to limit surface warming to less than two degrees Celsius, , mainly by shifting from use of fossil fuels. Governments have agreed to work out by 2015, a global deal to combat climate change . It is ninety per cent certain that human activities, rather than natural variations in climate are the main cause of warming in recent decades. Equilibrium climate sensitivity is bench-mark in climate science. .But it is a very specific measure. So it is a rational thing to ask how climate change sensitivity might be changing and as such the governments have to address what the policy consequences might be.