All #mammals left today came from this robin-egg-sized burrower that made it through the asteroid hit 256My ago, Ward,Ooopsy, we've driven the statistical_mean of oceans from 8.2/35‰/-2C freezeup where #habitability resides down to 7.9pH earth's #extinction pH dissolving macro-corals, reefs & limestones till #rock_erosion raises it back up near 8.2, Feely,Last year's 42-Gt CO2 became 12.6-Gt's worth of carbonic_acid, until that's gone the extinction is a too low water_column pH prevents conducting air's COLD to #ArcticBasin seabed #methane clathrate deposits now thawing 
• These don't thaw during #interglacials or we'd known about it, ours ends in 1500yrs by Milankovitch cycles, pdf,• Zeebe needed extra carbon late in the 50,000yr preamble of flood_basalts to match sediment cores in his model,• Wing suspected these deposits as the source,~
Shakhova & Semiletov clips when they hauled labs and quarters on sleds to sites, 8;36,~
Their work in teams in these pprs:
Chernykh+deposits:2023,Bukhanov+bubbles:2020,~
Conclusions:
We're dissolving plankton 10-times faster than PETM's flood_basalts did, Feely 
+
#OceanAcidification is worse to 300My ago includes both major extinctions relevant to homo-sapiens to state firmly NO mammals will make it through what we've already done as-is,=
We must refreeze the ArcticBasin manually, 6-leg drill-rigs a fleet of 100-rigs placing 10,000 chill-rods/km² takes a week, for 1-fleet to do it all takes 2300yrs for scale 
Fwiw
•~
• Eye socket & beak, fountain pen for scale it could breathe hydrogen_sulfide to 200ppm 
• Steps to an Extinction or Prevention summary of rough project logistics & machines
• 12hp sketch of NikolaTesla Tailpipes cut any exhaust to under 1% he intended for the 1.4-billion point_source ICEngines now running 90yrs ago
• Adding algae-growers to existing sewage treatment plants gains 30% of volume biodiesel/biocrude-CO2 +O2 renews daily 
• 742-plants 10M-gal/day equivalent supply known oil reserves by when they run out 
• A project for then Gov.JanBrewer AZ USA vetoed by Sen.McCain or in USA we'd be $1.25/gallon at the pump and free of foreign oil wars
#mammals #habitability