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Novità › Gli studi sui gas serra...
Gli studi sui gas serra...
Postato da Grazia01 il Venerdì, 30 aprile @ 18:27:14 CEST (90 letture)
Ecologia e ambiente I

Il 2015, secondo l'ONU, è stato l’inizio di una nuova era climatica. Negli anni precedenti, infatti, i livelli di CO2 presenti nell’aria raggiungevano la soglia di 400 parti per milione, solo in alcuni mesi e, mai prima di quel momento, la media dei mesi, su base annuale, aveva superato quella soglia. Nel 2016 la concentrazione di CO2 fu costantemente al di sopra di 400 ppm per tutto l'anno. Sono passati pochissimi anni e l’osservatorio di Mauna Loa, alle Hawaii, che da decenni monitora i dati a livello mondiale, ci dà notizia di un altro triste primato: abbiamo superato le 420 parti per milione.
Gli studi sui gas serra, infatti, rivelano che questi valori di Anidride Carbonica c'erano già stati tra i 2 e i 4,6 milioni di anni fa, quando le condizioni climatiche sulla Terra erano estremamente diverse.






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