Peak sulfuric acid 

"Sulfuric acid is called the “king of chemicals” because it is the most widely used chemical on earth. Over 260 million metric tons were produced in 2021 for lead acid batteries, detergent, rayon, paper, iron and steel pickling, glass, cement, adhesives, sugar refining, fireworks, rubber vulcanization, explosives, pesticides, drugs, plastics, pigments, water treatment, and 30,000 other products.

Sulfuric acid is also essential for electric vehicles, batteries, solar, wind turbines, semiconductors and other green technology, because sulfuric acid is how you get lithium, cobalt, nickel, copper, and some rare earth metals by dissolving the rock around them.

But over half is used for the most important product of all, dissolving phosphate out of rocks to make phosphate fertilizer, which can increase crop production by 50%, to grow our fuel: food.  And not only that, but to make the universal energy currency of all life on earth, Adenosine tri-phosphate (ATP) which powers all cells. Plus, all living creatures are part phosphate, it’s in our DNA, RNA, cell membranes, bones, and teeth.

Yet sulfuric acid shortages loom in the future, even though sulfur is the fifth most common element in the world!   So how on earth could there ever be a sulfur shortage?

It may be common, but deposits large enough to exploit are extremely rare, mostly near volcanoes.  Most sulfur or sulfates are combined with copper, iron, lead, zinc, barium, calcium (aka gypsum), magnesium, and sodium.

Today 80% comes from oil and natural gas refining into pure elemental sulfur, easy to transport and with the bonus of preventing sulfur dioxide emissions and acid rain.

But there are scientists warning about 25 years of conventional oil left in the world at current rates of consumption.  Others say more than that.  But whatever the amount left, exponential growth from population and capitalism shortens consumption time.

The remaining 20% is mainly gotten by the Frasch process which requires dumping lots of superheated water into boreholes drilled into sulfur bearing rocks, water boiled by fossils today, vast amounts of wood in the future.  This method releases not just sulfuric acid but toxic metals like arsenic, mercury, lead, cadmium, and chromium that can leach out for millennia, poisoning rivers and groundwater.  Dozens of the 1,334 U.S. EPA superfund sites are abandoned copper, zinc, and sulfur mines, are still leaching sulfuric acid and poisonous metals decades later (EPA 2022)."

https://energyskeptic.com/2022/peak-oil-peak-food-the-king-of-chemicalssulfuric-acid/