La neve sta scomparendo non solo sull'Altipiano ma anche alle alte quote, "probabilmente" a causa del riscaldamento climatico. Lo hanno scritto mercoledì gli scienziati dell'Università di Ginevra analizzando 20 anni di dati satellitari dando il via anche a uno strumento nuovo, lo Swiss Data Cube, che consente alla Svizzera di essere all'avanguardia sullo studio dell'ambiente e che mette a disposizione del pubblico su un sito web dati su molti altri aspetti, tra cui le variazioni della vegetazione, l'urbanizzazione e la qualità dell'acqua.
I ricercatori hanno osservato l'evoluzione dell'innevamento sul territorio elvetico constatando che le zone dove nevica poco o addirittura mai coprivano il 36% del paese nel decennio 1995-2005, mentre tra il 2005 e il 2017 queste sono aumentate al 44%.
Le aree ricoperte da nevi perenni, dove le precipitazioni "bianche" oscillano tra l'80% e il 100%, si sono ridotte dal 27% al 23% del territorio, vale a dire una perdita di 2'100 chilometri quadrati, "sette volte la superficie del canton Ginevra", sottolineano gli autori dello studio, che mettono in guardia: "È un dato preccupante non solo per il turismo, ma anche per le inondazioni e l'approvvigionamento idrico".
Per saperne di più:
- lo studio integrale
- il sito web di Swiss Data Cube
Le neve sta sparendo
RSI Tech&Scienza 12.09.2018, 17:59
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