🇺🇸 Memorial Day events 🧳 Southwest’s skycaps 📸 Wonderfront Festival photos 🏙️ S.D.’s highest pool 🎨 San Diego airport art exhibition ...

Forty years ago this month, scientists reported that human activities had punctured Earth’s protective ozone layer. What happened next offers a masterclass in international science-diplomacy.

Al Minier and Kathy Walker are watching — and worrying.