czk_21 t1_j6nvaow wrote
how dire really?, quick warming is BAD for sure but for comparison in https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum global temperature was 5-8 C degrees higher than today and it was no armageddon, temperature 2 degrees higher wont be either
fungussa OP t1_j6nzwzi wrote
Lol, what? The PETM caused a major disruption to global ecosystems and had a severe impact on ocean chemistry and marine life, where approx two thirds of marine species went extinct. https://www.pnas.org/doi/10.1073/pnas.2003197117
At a mere +2C there'll be multiple, simultaneous breadbasket failures, and at +4C large scale agriculture will largely collapse.
Unusual-Diver-8335 t1_j6pc97z wrote
>two thirds of marine species went extinct
over the course of ~1,000 years
Contrarily, planktonic foraminifera diversified, and dinoflagellates bloomed. Success was also enjoyed by the mammals, who radiated extensively around this time.
https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum
AndyTheSane t1_j6p5s5q wrote
Yeah, we wouldn't even notice 27m of sea level rise, or the complete breakdown of modern agriculture...
Unusual-Diver-8335 t1_j6pcovb wrote
>Warming of 2 °C will lead to an average global ocean rise of 20 cm, but more than 90% of coastal areas will experience greater rises. If warming continues above 2 °C, then, by 2100, sea level will be rising faster than at any time during human civilization, and 80% of the global coastline is expected to exceed the 95th percentile upper limit of 1.8 m for mean global ocean sea level rise.
>
>https://www.pnas.org/doi/10.1073/pnas.1605312113
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