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* 1. How much CO2 does human activity create every year, globally?

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* 2. Climate action aims to limit global warming by how many degrees (above pre-industrial levels)?

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* 3. Which of these activities reduces the amount of CO2 in our atmosphere?

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* 4. What does "net zero carbon" mean?

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* 5. To contain global warming to 1.5 degrees, how much CO2 must we capture and store this century?

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