New York Times: Jeff Opperman, a senior freshwater scientist with the Nature Conservancy, is taking a once-in-a-lifetime trip down the Mekong River in Southeast Asia with his wife and two children, ages 8 and 10. Previous posts can be found here. As we traveled down the Mekong River, I kept hearing variations of the same story: There are fewer fish. Our guide in the Four Thousand Island region of Laos relayed that fishermen now work longer hours and catch fewer fish. At a fishing camp just below Khone Falls,...