No. That "Great Nutrient Collapse" Politico story is propaganda, not science.
The studies have not found
evidence that the overall nutritional value of crops is reduced by the
improved plant productivity from CO2 fertilization. Rather, they've
found that when crops are grown in iron-poor or zinc-poor soil, the
larger yields may contain lower levels (though not lower overall
quantities!) of those micro-nutrients.
it happens, dietary shortages of those micro-nutrients are easily
resolved through either fertilization or very inexpensive nutritional
supplementation. In the case of iron, it can be as simple as cooking in
is possible to contrive growing conditions in which something other
than CO2 limits plant growth and health, or in which a shortage of some
soil nutrient causes better crop yields to be accompanied by reduced
levels of some nutrient, but such contrived conditions are easily
avoided through normal agricultural fertilization practices. Under
real-world conditions, additional CO2 is dramatically beneficial for
agriculture, to levels far beyond what we can ever hope to reach in the
outdoor atmosphere, and the nutrient value of crops grown with extra
CO2 is not significantly different from other crops.
you want proof of that fact, read up on the relative nutritional values
of crops grown in greenhouses vs crops grown outdoors.
commercial greenhouses use CO2 generators to keep CO2 at 3x to 4x
ambient levels, at significant expense. That's an increase 6 to 10 times
as great as the measly ~125 ppmv increase
which mankind's fossil fuel use has caused in outdoor levels. Greenhouse
operators spend the money to keep CO2 levels that high because doing so
dramatically improves the growth of most plants. If the modest increase
in outdoor CO2 levels were making crops significantly less nutritious,
then crops grown in greenhouses at dramatically higher CO2 levels would
necessarily be dramatically less nutritious than crops grown outdoors.
of course, that is not the case. Studies show that food grown in
greenhouses at elevated CO2 levels has about the same nutritional value
as food grown in open fields at ambient CO2 levels.