Chapter 15 Global Warming Models

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Make models to understand why the earth is warming.

As I sit writing this in 2018, I’ve just lived through the earth’s 18 hottest years on instrumental record with one exception. That’s not to say there were not hotter years back in prehistory. When the earth was just forming some 4.5 billion years ago, nonstop volcanoes and meteor showers made for some toasty summers. But the steady trend for the last century has been warming, and the rate of warming shot up beginning in the 1970s. What we’re seeing now is the fastest temperature change ever measured directly.

A number for the temperature of the earth ...

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