Population

1. My grandparents had 5 and 3 children. My parents have 3 children. I would have 2 or less, if possible.

2. Japan's population is about 120 millions. Dense population makes it easier to get public services such as public transportation. Japan's population begins to decline, which means not enough workforce to support elderly people, causing concern about feasibility of pension system.

3. Currently, earth's population is estimated about 6.5 billions.

4. Animal species populations are controled by the following factors; food supply, loss of habitat, natural enemies, caught by human (poaching), etc.

5. No. As population explosion often comes from poverity, ignorance about reproductive health, or oppression over women, I think goverment should address those problems first.