Have these idiots ever heard of photosynthesis? Plants CONSUME CO2 and produce O2, which will safeguard imaginary CO2 increases.
Left unchecked, plants would get bigger with increased CO2 levels. But more farmland will produce more food to feed the billions on this planet. So you can argue that more CO2 can be beneficial.
BTW, what those “scientists” are espousing is the discredited Malthus effect.
One of Bill Klinton’s 1000 scientists was a barber. Makes you wonder.