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Based on this graph unless someone can document that CO2 levels in our atmosphere in parts per million were higher in the 1920-1940's than it was in the 50's through 80's, I don't see any link between humans and global warming. I see 25-35 year warming/cooling trends which are well documented over the last several hundred years. As well a larger longer lasting mini-iceage that we are coming out of. This would explain the slightly higher temperatures in the 20 some year trend vs. the 1920's through the 1940's
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"any man who would trade freedom for security, deserves neither freedom nor security" Thomas Jefferson
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