1. How many people live in the world today?, 8 billion, 3. Why is it difficult to count all people in the world?, It is impossible to count everyone, What was the world population in 1950?, 2.5 billion , What was the population in 2000?, 6.2 billion , What was the population in 2010?, 7.0 billion .

Leaderboard

Visual style

Options

Switch template

)
Continue editing: ?