The United Nations projects that the proportion of the global population living in developing countries will rise from 83% in 2003 to 88% in 2050. What is the most likely main reason for this forecast change?
- AClimate change will lead to lower food output and starvation.
- BImproved education for girls will lead to a small decline in birth rates.
- CIncreasing numbers of people will migrate to developed countries.
- DModern medicine and sanitation will lead to a rapid decline in death rates.