The global spotlight on the refugee crisis has been prompted by the unprecedented migrant wave, not seen even during World War II. And the wave isn’t ebbing. Instead, it continues to grow and has brought in its wake a tsunami-like impact. How far the New York Declaration adopted at the recent UN Summit for Refugees and Migrants would help ...

  What a moment for President Obama to deliver his valedictory address to the U.N. Tuesday — defending the liberal international order at a time when it’s under severe stress around the world. Obama’s speech was preceded by some sickening reminders of how global security is fraying: The day before, a Syrian, or perhaps Russian, airstrike had ravaged a U.N. ...

  Self-driving cars got a green light from the U.S. government this week, but still have their own challenges: erratic human drivers, compromised visibility, unexpected route changes. Here’s one they won’t face until they catch on: zoning. As soon as self-driving cars are readily available, proponents will run into political battles over land use, a challenge familiar to urbanism advocates. ...