Which one do you think would be the World's most risky situation?

1.      The problem of HIV Aids

2.      The problem of being Druggist

3.      The problem of human Depression

4.      The problem of Ground and Air traffic

5.      The problem of fresh water for drinking and agriculture

6.      The problem of global warming

7.      The problem of loss of biodiversity

8.      The problem of continuity of generation due to gay, lesbian and homosexual

9.      The problem of food

10.  The problem of conflicts/war