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1. What does the term "analogue" mean as used in Part I: Cascades?

2. How many mass extinctions has the earth experienced prior to the one we are living through now, according to the author in Part I: Cascades?

3. The author states in Part I: Cascades that all mass extinctions aside from the one that killed off the dinosaurs were caused by what?

4. The rate at which humankind is adding carbon dioxide into the atmosphere is how many times faster than any point in human history before the beginning of industrialization?

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