Both global warming and energy security are inherently international problems, to which national solutions can at best offer partial answers. (issues.org)
Additionally, there is a major international problem with counterfeit drugs. (investopedia.com)
The declared purposes of United Nations are to maintain peace and security, to develop friendly relations among nations, to achieve international cooperation in solving international problems, and to be a center for harmonizing the actions of the nations and attaining their common ends. (primerus.com)