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These Bizarre Blue Tree Rings Are Unveiling Details About Cold Summers From A Century AgoThese blue rings help scientists look into the past and pinpoint any cold summers ... they found that the summers of 1902 and 1877 had very low temperatures. The coldest June ever recorded was ...
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Curious blue rings in trees and shrubs reveal cold summers of the past—potentially caused by volcanic eruptionsSince trees and shrubs can live for hundreds of years, identifying these blue rings allows us to spot cold summers ... by very low summer temperatures. In 1902, the coldest June ever recorded ...
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