From 1876 to 1973, how much did the glaciers that covered the Alps shrink?
Forty percent of the glaciation in Austria has disappeared since 1850, and 30% of that in Switzerland.
С 1876 по 1973 год, насколько сократились ледники, покрывавшие Альпы?
Сорок процентов оледенения в Австрии исчезло с 1850 года, а 30% - в Швейцарии.