Top Five Global Problems:

1.Global Warming
to stop global warming I would do a signature between nations to commit to caring for the environment.

2.Nuclear Proliferation
It is clear that we can not stop the use of nuclear compounds, but we can reduce their use.

3.Disease (Aids/Hiv, Cancer)
For fatal diseases, if you can call it, I would help scientific research to cure these ills

4.Resource Consumption forsets and Ocean: 
For resource consumption, I would create a campaign supported by the top 10 countries or potential nations.

5.Conflict between Nations