A look at the California dairy sector, tractor replacement, and other clean-air innovations. A robotic, electric-powered feed pusher moves feed closer on a Merced County dairy farm. C alifornia farmers have made major strides to help clean the air. Over the past two decades, about 15,000 pieces of agricultural equipment  in the San Joaquin Valley have been replaced wither newer, cleaner versions. This has been done in partnership with the state, with public and private invest

Milk and dairy products play an important role as one of the most cost-effective sources of underconsumed nutrients—including potassium,...