1. poverty, which causes the lack of every family.
2. education, due to lack of money.
3. Corruption , causes to people become poor .
4. climate change, which causes people's illness.
5. terrorism, which brings disaster to us
And you ignored the root cause behind most of these problems. The root cause is the over-population and the competition for the resources resulting from it. Look at countries such as Egypt and Bangladesh. These nations have some of the highest population densities in the world, and still the population is growing by close to 3% per year.