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Lived 1821 – 1890. James Croll linked climate change, our planet’s ice ages, and astronomy, proposing that climate change is caused by periodic changes in the amount of energy our planet receives from the sun. With little schooling and entirely self-taught in physics, celestial mechanics, and philosophy, he formulated his visionary ideas and began publishing them while working as a janitor. Croll said the solar energy reaching our planet’s southern and northern hemispheres varies, rising or falling depending on Earth’s location and orientation in space versus the sun. Our planet’s ice ages are caused by solar energy variations altering the trade winds, and hence the strength of ocean currents, such as the Gulf Stream, that carry warmth from tropical regions to polar regions. Croll also devised the concept of ice-albedo feedback. Prior to Croll’s work, Karl Schimper and Louis Agassiz claimed Earth had experienced ice ages in the past. They based their claim on evidence they found in rocks and landscapes. Their claims were disputed because they offered no convincing mechanism to explain the cause of ice ages. Croll provided this mechanism, lending credibility to the concept of ice ages. His theory was then forgotten until in the twentieth century Milutin Milankovic revived it in a mathematically more highly developed form.

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