For much of its history, the San Joaquin River carried cold mountain water through California’s Central Valley, supporting forests, farms and some of the southernmost populations of Chinook salmon in the western United States. That connection began to disappear after the construction of Friant Dam in the 1940s, when large sections of the river were…

FILE – The Syngenta logo is seen outside the company’s headquarters, Feb. 7, 2007, in Basel, Switzerland. (Georgios Kefalas/Keystone via AP, File) Syngenta’s decision to stop selling paraquat in Australia marks a major shift in the country’s herbicide market. The move comes after the national regulator tightened safety rules on one of the world’s most…