… [T]he state has been working with private companies to put over 130 dairy digesters — or systems that trap the methane released from large lagoons of manure — on farms. … The digesters have been shown to be effective at cutting methane emissions, but they’re also increasingly controversial among environmental groups and Central Valley residents. Now, some of those groups are suing the state’s air management board over amendments to the LCSF that went into effect in July. … The environmental and animal welfare groups … claim that the policy will spur larger dairy operations to expand in scope, which will cause more water contamination and air pollution in the communities near the operations.