The Organization of American States meets on the Venezuela crisis, German Prime Minister Angela Merkel visits China, and the race for Raqqa in Syria intensifies.

President Donald J. Trump visits Puerto Rico, Catalonia holds a referendum, and German chancellor Angela Merkel tries to form a government.

German Chancellor Angela Merkel visits the United States; the UN Security Council takes up Yemen's future; and the G20 finance ministers meet in Istanbul.

German Chancellor Angela Merkel visits Russia, U.S. President Donald J. Trump marks one hundred days in office, and the UN observes World Press Freedom Day.

The world is already witnessing the effects of climate change. One inescapable and irreversible consequence is sea-level rise, which could destroy coastal cities. How will the world adapt to rising t…