What solutions have the world's leaders suggested for slowing the growth of world population

Family planning is one of the preferred practices to be enforced on the citizens to reduce population.

Explanation:

Historically, human population was intended to increase the population to a significant rate. But in the last 50 years, with the increase in population, the poverty, environmental degradation resulted to reduce the human growth rates. Population can be reduced by enforcing practices like contraception, sterilization, high taxes for parents of many kids, family planning, creating small family role models, emigration etc.

Ibelieve the answer is c. map projections.hope my answer has you : )