Superb Professors

• Explain how the carbon cycle works.
• What is the current CO2 concentration in parts per million (ppm)?
• How does this compare to the highs or lows over the past 450,000 years?
• What are the three most abundant sources from which humans add CO2 to the atmosphere?
• Explain the two main natural carbon sinks that remove CO2 from the atmosphere.
• Explain in detail two ways deforestation contributes to the increase in CO2 levels.
• What are some other greenhouse gases, and how do their concentrations compare to the past 450,000 years?
• Based on the data, are humans contributing to climate change, or is it strictly a natural part of the cycle? Defend your answer. You must weigh all of the data, and use them to formulate your conclusion.

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