The graph shows the world population since 1950.
Line graph showing world population from 1950 to 2010 represented by population in billions by year. In 1950, population was around 2.5 billion. In 1965, 3 billion. In 1980, around 4.5 billion. In 1995, around 5.5 billion. In 2010, around 7 billion.
What is the projected population size in 2025?
6 billion
7.5 billion
8.5 billion
9 billion