Rick Karlin is reporting in the Times Union Gov. Andrew M. Cuomo's push to make New York the nation's "Yogurt Capital" is hitting a sour spot in the form of a court challenge to his loosening of environmental regulations for dairy farmers. Just short of a year after Cuomo said he would ease the rules for medium-size dairy herds as a way to help farmers meet the growing demand for milk used in Greek-style yogurt, a coalition of environmental groups has filed suit. They claim the regulations were improperly eased and could add to water pollution through poorly controlled manure runoff. Known as CAFO regulations, or Concentrated Animal Feeding Operations, the rules mandate construction and management of tools for keeping manure and other waste products out of the water supply. Farmers complained the cost of the systems, which can run into six figures, has stopped them from expanding. Earlier this year, more lenient rules went into effect for dairy farms with between 200 and 299 cows. Read the full story in the Times Union.