JULIA ANGWIN and JENNIFER VALENTINO-DEVRIES:

For more than two years, the police in San Leandro, Calif., photographed Mike Katz-Lacabe’s Toyota Tercel almost weekly. They have shots of it cruising along Estudillo Avenue near the library, parked at his friend’s house and near a coffee shop he likes. In one case, they snapped a photo of him and his two daughters getting out of a car in his driveway.

Mr. Katz-Lacabe isn’t charged with, or suspected of, any crime. Local police are tracking his vehicle automatically, using cameras mounted on a patrol car that record every nearby vehicle—license plate, time and location.

“Why are they keeping all this data?” says Mr. Katz-Lacabe, who obtained the photos of his car through a public-records request. “I’ve done nothing wrong.”

Owen Fletcher:

Want to see where your food might come from in the future? Look up.

The seeds of an agricultural revolution are taking root in cities around the world—a movement that boosters say will change the way that urbanites get their produce and solve some of the world’s biggest environmental problems along the way.

It’s called vertical farming, and it’s based on one simple principle: Instead of trucking food from farms into cities, grow it as close to home as possible—in urban greenhouses that stretch upward instead of sprawling outward.