North Korea pens an angry letter to the U.S., complaining about continued harsh U.S. rhetoric directed at the regime after the Singapore summit.

The U.N. nominates former Chilean president Michelle Bachelet to serve as its next human rights chief.

Most Americans think global warming is happening – they also think they can dodge its direct effects.

The world just crossed a major energy milestone by producing one terawatt of renewable energy, largely from solar and wind power.

Venezuelan President Nicolás Maduro survives an alleged assassination attempt using an armed drone. Experts say the incident exposes the weaknesses of his security apparatus.

The U.S. scolds Russia over (more) alleged North Korean sanctions violations – this time for allowing in more North Korean laborers.

In Malaysia, touts a new US plan for more transparent foreign investment – a contrast with China's One Belt One Road initiative.

Just 13 percent of the world's oceans are untouched by intense human impact like ocean acidification, pollution run-off, shipping, fishing or oil extraction.

Iranian officials brush off an offer for leader-to-leader meetings between President Trump and Iranian President Hassan Rouhani. Three experts help us understand why.

The U.S. sharply condemns elections in Cambodia and state-sponsored violence in Nicaragua as voting monitors take in a historic presidential vote in Zimbabwe.