Carbon dioxide concentrations are increasing in the atmosphere. Explain how this can lead to either a positive feedback loop (whereby carbon dioxide concentrations continue to increase) or a negative feedback loop (whereby carbon concentrations begin to decrease). Be specific in describing the steps of the feedback loop, and be sure to indicate whether it is a positive or negative loop.

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global CO2 levels in the past million years were at or higher concentration that they are today (i.e. over 407 ppm). True or False

Q2: what is the correct answer