The Green Revolution contributed to a population explosion due to research and technology breakthroughs in the mid$-1900$s$.$

Select one statement that does NOT describe a result of these breakthroughs.

All nations became stronger and more self$-$sufficient as the population increased.

Advances were made in sanitation and medicine that improved lives.

Improvements to agricultural crops increased production worldwide.

Fertilizers were chemically produced, which improved food supplies.