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Cake day: July 18th, 2020

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  • We needed to get this shit done 10 years ago. Any delay in removing all fossil fuel emissions now is just a matter of how bad we want climate change to get, rather than preventing it. Net zero by 2050 is a fucking eternity away and is a shit goal, and all the projections that get us on track to 1.5 °C of warming have us extensively using carbon capture which is entirely unrealistic.

    Existing nuclear plants in France work, they can load follow to some degree, and renewables can make up the difference with minimal energy storage. But at a certain point you have to stop investing in renewables if you have minimal energy storage and your electricity solution is working.

    I am going to emphasize that last part: IF you can’t get enough energy storage, and IF your energy mix is fine, you must stop investment in renewable installations. Without enough storage, the baseload+peak paradigm works, you just have to regulate it.












  • Xavienth@lemmygrad.mltoScience Memes@mander.xyzStress
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    1 month ago

    A successful organism would not have evolved to highly express cortisol to weed itself out in the case that it has a stressful life. It makes no sense for an organism to evolve a trait that makes it at best equally likely and at worst less likely to reproduce.

    The reason we release excess cortisol in modern life is because our bodies did not evolve for constantly present stressors, they evolved to be stressed in a situation, run away from the tiger, and then you’re good.



  • Xavienth@lemmygrad.mltoScience Memes@mander.xyz#justposeidonthings
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    2 months ago

    It’s less the result of a sensible system of units (like how 1 L of water ideally weighs 1 kg), and more fortunate happenstance in this case.

    The formula for hydrostatic pressure* is:

    ∆P= ρ·g·∆h

    where ∆P is the difference in pressure across the difference in height ∆h, ρ is the density of the liquid (~1000 kg/m³ for water, slightly more for sea water), and g is the acceleration due to gravity.

    So the reason it works out nicely is because g is a little bit less than a nice factor of ten (9.8 m/s²), and the density of sea water is a little bit more than a nice factor of ten (typically 1025 kg/m³), and 1 atm also happens to be almost a nice factor of ten (101,325 Pa). That’s why the difference between the approximation and the actual* is less than a percent.

    *This assumes a constant density of the liquid, which for water is reasonable, however different depths can have different salinities and temperatures in layers which change the density by less than a percent. Additionally, this assumes a constant acceleration due to gravity. At depth, the acceleration due to gravity can be higher, but this also has an effect that amounts to less than a percent even at the deepest point in the ocean.