What is the key concept for this section? What are Milankovitch cycles and how do they affect climate, according to theory? What is the greenhouse effect and why is it so important to life on the earth? What are three key greenhouse gases and how do they differ in atmospheric lifetimes and warming potentials? What is the role of water vapor in the atmosphere and how does it relate to other greenhouse gases in the warming process? What are two other natural factors affecting atmospheric warming and climate change?
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