Toe the line. That’s the call from the mining association in the world’s biggest nickel ore supplier where members are facing a crackdown led by Philippine President Rodrigo Duterte, who’s said the Southeast Asian nation can live without the industry’s contribution entirely if need be. Members are being urged to “walk the walk” as far as environmental compliance is concerned, according to Ronald Recidoro, VP for legal and policy at the Chamber of Mines of the Philippines. “As a professional association, that’s basically what we can do,” Recidoro said in an interview.