U.S. President Joe Biden, center, speaks with Turkish President Recep Tayyip Erdogan, left, and NATO Secretary General Jens Stoltenberg during a plenary session at a NATO summit in Brussels, June 14, 2021 (AP photo by Olivier Matthys).

Tensions within NATO over the past two decades have led some to assert that the old military alliances of the 20th century are a thing of the past. Soon, the argument goes, they will give way to looser, ad hoc groupings like the Quadrilateral Security Dialogue, or Quad, comprising Australia, India, Japan and the United States; the AUKUS security pact among Australia, the United Kingdom and the United States; or other “coalitions of the willing” formed to address specific concerns, like those that intervened in Kosovo, Afghanistan, Iraq and Libya. To be sure, the past 30 years have punched some […]

Demonstrators in Western France protest against a project to build an international airport in Notre-Dame-des-Landes, near Nantes, Nov. 17, 2012 (AP photo by David Vincent).

On Oct. 14, just two weeks before the start of the United Nations’ Climate Change Conference in Glasgow, an unusual organization commemorated its fifth anniversary: Stay Grounded. The group, founded in 2016, is an international activist network of more than 170 smaller protest movements from across the globe. Through “mutual support and exchange of experiences,” it hopes to inspire and guide collaboration around the shared goal that brings its members together—namely, reducing “aviation and its negative impacts.” In the years since Stay Grounded started work, it has made a case for seeing anti-airport social movements as a truly global phenomenon. […]