As a matter of fact water does absorb considerable part of the excess heat from the sun reaching the earth due to depletion of ozone layer. But the total quantity of excess heat is so much that it leads to rise in temperature of the oceans also, and it is this rise in ocean temperature that poses one of the biggest threats of global warming.
It is important that when we talk of global warming, it is not important to note that the catastrophe will strike much before the temperature of ocean rises to levels too uncomfortable for humans or most of other animals to bear. For the global warming to reach catastrophical levels it is enough for the average temperature of the oceans and the rest of the earth to increase by less than 2 degree from the present. This marginal rise in temperature is enough to melt the ice caps irreversibly, which will lead to submerging of coastal areas that is home to nearly 15 percent of the world population. This is the kind of catastrophe humanity is not in a position to deal with.
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