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xkcd : Earth Temperature Timeline
(imgs.xkcd.com)
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This is a work in progress, please don't mind the mess.
What is geoscience?
Geoscience (also called Earth Science) is the study of Earth. Geoscience includes so much more than rocks and volcanoes, it studies the processes that form and shape Earth's surface, the natural resources we use, and how water and ecosystems are interconnected. Geoscience uses tools and techniques from other science fields as well, such as chemistry, physics, biology, and math! Read more...
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Climate
It's just a question of scale and thermodynamics. Using the renewables to do carbon capture is probably a good idea, because anything is better than the giant greenhouse gas. But that really is geoengineering too. And it'll only work for a period. As energy use increases, you will modify the planet more and more simply due to collecting and distributing the energy. Energy must flow from concentrated forms to dispersed forms. That dispersed form is usually heat.