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Le attività umane che nel 2014 hanno contribuito al riscaldamento globale, come nel caso delle emissioni di gas a effetto serra, hanno aumentato significativamente anche l'incidenza dei fenomeni estremi.
Ad affermarlo è un rapporto governativo statunitense del NOAA (National Oceanic and Atmospheric Administration) che ha analizzato 28 eventi.
Solo per otto di essi gli scienziati non hanno trovato una relazione di causa-effetto con i mutamenti climatici, come nel caso delle tempeste di neve che hanno flagellato l'America del Nord nell'inverno del 2013-2014.
AFP/mf
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