China is North Korea’s biggest trade partner and has leverage over Kim Jong-un’s regime, yet its policies focus more on border stability than nuclear threat.

Beijing has tightened its grip on Hong Kong in recent years, dimming hopes that the financial center will ever become a full democracy.

International efforts, such as the Paris Agreement, aim to reduce greenhouse gas emissions. But experts say countries aren’t doing enough to limit dangerous global warming.

The UN Security Council is the premier global body for maintaining international peace and security, but it faces steady calls for reform to better meet twenty-first-century challenges.

Responsible for powering the country and its economy, the U.S. energy grid has come under increasing strain due to climate change, and the threat of cyberattacks looms.