(Part of the How to Talk to a Global Warming Skeptic guide) Objection: The sun is the source of warmth on earth. Any increase in temperature is likely due to changes in solar radiation. Answer: It's true that the earth is warmed, for all practical purposes, entirely by solar radiation, so if the temperature is going up or down, the sun is a reasonable place to seek the cause. Turns out it's more complicated than one might think to detect and measure changes in the amount or type of sunshine reaching the earth. Detectors on the ground are susceptible to …
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