I am skeptical that CO2 played a significant role in causing that change in temperature. So when I say I am skeptical of global warming, I am very specifically discussing the theory that increasing CO2 levels will cause the Earth's temperature to increase. That is the foundation of AGW (Anthropogenic Global Warming). This theory states that humanity is causing the warming that the Earth has recently experienced by increasing the concentration of CO2 in the atmosphere through the burning of fossil fuels. I never intended to write a book about global warming. If you had asked me 4 years ago
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