 Supreme Court upends a 40-year-old decision that made it easier for the federal government to regulate the environment, public health, and other things. The court delivered a far-reaching and potentially lucrative victory to business interests, ruling in cases brought by fishermen in New Jersey and Rhode Island. The justice has overturned the 1984 decision known as Chevron. Billions of dollars are potentially at stake in challenges that could be spawned by the ruling.