Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas 65 | Michael Mann on Why Our Climate Is Changing and How We Know
Sep 23, 2019
Michael Mann, a distinguished professor of atmospheric science at Penn State and renowned climate expert, discusses the urgent reality of climate change. He explains the science behind the greenhouse effect and the rapid temperature increases he unveiled through the 'hockey stick' graph. Mann addresses the connection between climate change and extreme weather while emphasizing the necessity of strong actions to avert worst-case scenarios. The conversation touches on the inadequacies of political responses and the importance of accurate climate communication and public trust in science.
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Greenhouse Effect: Essential for Life
- The greenhouse effect, while often viewed negatively, is crucial for Earth's habitability.
- Without it, Earth's temperature would be a frigid -18 degrees Celsius, rendering it a frozen, lifeless planet.
The Physics of Greenhouse Gases
- Greenhouse gases are transparent to visible light from the sun, allowing it to reach Earth.
- However, they absorb infrared radiation emitted by Earth, trapping heat and warming the planet.
Arrhenius and the Greenhouse Effect
- Svante Arrhenius, known for his contributions to chemistry, also recognized the greenhouse effect.
- He was aware that burning fossil fuels could increase the effect, though he didn't foresee it as a major problem.