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How have scientists obtained evidence of the changes of Atmospheric substance concentrations over the past 300 years?
Wiki User
∙ 12y ago
For starters, Ice Scientists have taken Ice Samples from literally thousands of locations all over Earth's surface.
Surprise! They each and all 'go back' not hundreds but many hundreds of thousands of Years. Yes, we possess a complete Record of Our Earth's Past [eventual] History!
Many other Means-of-Analysis derive from these Ice Core Samples - most notably Gas Chromatography.
Wiki User
∙ 12y ago
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