What effect does salinization have on North Africa and Southwest Asia? increases food security
reduces the land's ability to produce food
reduces the migration of people to urban areas
reverses habitat loss

simply it degrade the fertility of soil and decrease the production.

Explanation:

The availability and increasement of salt in soil with both naturally and artificially due to which it degrade the quality of soil and production which is mainly seen in North Africa and southwest Asia.

the answer is the last option or letter d)