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Il livello dei mari si innalza sempre più e ad accelerare il fenomeno contribuisce lo scioglimento dei ghiacci in Groenlandia e nell'Antartide. Di questo passo, alla fine del secolo gli oceani saranno più alti di 60 centimetri rispetto ad oggi. Lo rivela una ricerca dell'Accademia Nazionale delle Scienze degli Stati Uniti, basata su dati satellitari degli ultimi 25 anni.
Due i fattori che provocano l'aumento del livello dei mari: il riscaldamento degli oceani, che fa espandere il volume dell'acqua, e lo scioglimento di ghiacciai e calotte polari.
Dal 1993, gli oceani si sono innalzati di 7,5 centimetri: il 55% per l'espansione dell'acqua; il 45% per lo scioglimento dei ghiacci. Ma l'innalzamento sta accelerando, e oltre tre quarti di questa accelerazione sono dovuti allo scioglimento dei ghiacci di Groenlandia e Antartide.
ANSA/BRav
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