How two limiting factors may affect human population growth. Use scientific reasoning.

1st reason

In the 20th century alone, wars were responsible for the untimely deaths of tens of millions of men, women and children. Around 150 million to 1 billion people have died of war so far. A WW3 can be life-treating because the US has a special kind of bomb that can produce a radioactive gas that can kill millions of people

2nd reason

Disease has always been one of the biggest limiting factors for humans. Illnesses carried off many people before they managed to reproduce and took the lives of most children before they reached the age of five.