SINTRA, Portugal (AP) — The doorbell to Martinho de Almada Pimentel’s house is hard to find, and he likes it that way. It’s a long rope that, when pulled, rings a literal bell on the roof that lets him know someone is outside the mountainside mansion that his great-grandfather built in 1914 as a monument to privacy.

There's precious little of that for Pimentel during this summer of “overtourism."

CARMEL-BY-THE-SEA, Calif. (AP) — No one in this wealthy California community known for its white-sand beaches and storybook charm has a street address. But unlike the houses in Carmel-By-The-Sea, those days may soon be numbered.

My colleagues and I have developed an artificial intelligence system that helps buildings shift their energy use to times when the electric grid is cleaner.