This is concerning, I’m also concerned about the acidification of the oceans caused by increases of atmospheric CO2 concentrations. If the food web collapses the microbes will inherit this planet.

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With your re acidification — and here is where we stand on that front:

“Prior to the Industrial Revolution, average ocean pH was about 8.2. Today, average ocean pH is about 8.1. This might not seem like much of a difference, but the relationship between pH and acidity is not direct. Each decrease of one pH unit is a ten-fold increase in acidity. This means that the acidity of the ocean today, on average, is about 25% greater than it was during preindustrial times.” (https://www.epa.gov/ocean-acidification/understanding-science-ocean-and-coastal-acidification#:~:text=Solutions%20with%20low%20pH%20are,ocean%20pH%20is%20about%208.1.)

Yep. At least hydrogen sulfide gas poisoning is a stinky but relatively pleasant way to die.