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1. How many prior mass extinctions has the earth experienced? What caused them?

There were five mass extinctions before the one that we are experiencing now, according to the author. The extinction of the dinosaurs was presumably caused by an asteroid, but the remaining four extinctions were caused by climate change produced by greenhouse gas.

2. What is the UNFCCC? When was it adopted?

The UNFCCC refers to the United Nations Framework Convention on Climate Change. It is an international environmental treaty adopted in May of 1992 with the objective of stabilizing greenhouse gas concentrations in the atmosphere.

3. What is the Paris Agreement? When was it ratified?

The Paris Agreement is an agreement within the UNFCCC dealing with greenhouse gas emission mitigation, adaptation, and finance. It was ratified in 2016 and has 185 signatories.

4. What is carbon dioxide?

Carbon dioxide is a colorless gas with a density that is about 60% higher than that of dry air. It consists of one carbon atom double-bonded with two oxygen atoms.

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