| Answer | Crossword Clue |
|---|---|
| ZERO | World dodo population |
| SNOWBALLING | Increasing, as world population |
| ASIAN | Like 60% of the world population |
| ASIAN | Like about 60% of the world population |
| AFRICANS | About one-eighth of the world population |
| IRONAGE | When it started, the world population was around 50 million |
