Since 1998, Harvard University wraps marble statues on its campus with waterproof covers every winter. Why?

to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
The eastern third of the United States is significantly impacted by acid rain. Acids in the rain react with the calcium compounds in the stones like limestone or marble to create gypsum, which then flakes off.
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Answers by country

to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
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flagthe Netherlands
11%
9%
72%
4%
43
flagthe United Kingdom
18%
5%
67%
5%
478
flagGermany
13%
9%
67%
8%
148
flagAustralia
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3%
67%
11%
127
flagPakistan
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8%
67%
5%
123
flagIndia
18%
5%
66%
6%
1079
flagKazakhstan
9%
15%
66%
5%
101
flagUnknown
22%
14%
63%
0%
49
flagMalaysia
34%
0%
61%
2%
49
flagPoland
21%
10%
60%
6%
24208
flagthe United States
26%
6%
58%
5%
1154
flagthe Philippines
23%
4%
57%
10%
113
flagNigeria
30%
2%
56%
6%
143
flagBelarus
19%
12%
54%
11%
102
flagRussia
15%
16%
52%
13%
509
flagCanada
27%
7%
52%
9%
102
flagthe United Arab Emirates
25%
13%
52%
5%
36
flagFrance
28%
14%
51%
0%
35
flagUkraine
22%
16%
45%
12%
586
flagRepublic of Ireland
37%
13%
37%
8%
45