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According to the Climate Change and Climate Science handout, how high are CO2 levels today compared with levels in the past? 1. The highest in

According to the Climate Change and Climate Science handout, how high are CO2 levels today compared with levels in the past? 1. The highest in 200 years 2. They are as high as they were before the last ice age, 100,000 years ago 3. The highest of the past 800,000 years and probably the highest in 3 million years 4. We really don't know how to compare with the past but we know we are pushing them higher, which could be dangerous

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