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83。成都調(diào)研)“The world’s oceans are slowly getting more acidic,” say researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere.The lowering of the waters’ pH value is not great at the moment but could cause a serious threat to current ocean life if it continues,they Caldeira and Michael Wickett,from the Lawrence Livermore National Laboratory,report their concerns in the journal use of oil fuels means that more carbon dioxide is going into the air,and most of it will eventually be absorbed by sea in the water,it reacts to form carbonic believe that the oceans have already bee slightly more acidic over the last century.These researchers have tried to predict what will happen in the future by bining what we know about the history of the oceans with puter models of climate change.“This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere,” says .“And we predict the amount of future acidity will exceed (超過(guò)) anything we have seen over the last several hundred million years,let alone perhaps after rare disastrous events such as asteroid (小行星) impacts.”However,it is not absolutely clear what that means for ocean organisms live near the surface,where the greatest pH change would be expected to occur,but deep173。ocean life forms may be more sensitiv