Increasing per capita income and improving especially for women in developing nations, are considered to be the most successful long-term solutions to excessive population growth.

Education

Explanation:

Decreasing child mortality, improving education and providing people with economic opportunities all help to reduce fertility and population growth. International aid, fair trade and global justice are all tools to help bring global population back to sustainable levels.

4 because 4 is godly

answer; i believe the correct answer is prefrontal cortex;