A little more than a year ago, on a trip to Nairobi, Kenya, some colleagues and I met a 12-year-old Masai boy named Richard Turere, who told us a fascinating story. His family raises livestock on the ...

Melting ice from the Himalayas is creating thousands of unstable lakes, a growing menace to towns and cities below. By Raymond ZhongJason Gulley and Bora Erden This summit is unlike any of its ...