Question: When did Al winter occur? 1 9 9 0 - 2 0 1 2 1 9 6 9 - 1 9 7 9 1 9

When did Al winter occur?
1990-2012
1969-1979
1980-1988
1988-1993
When did Al winter occur? 1 9 9 0 - 2 0 1 2 1 9 6

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