Cutting across political lines, Lok Sabha members on Monday joined hands to demand immediate intervention by Prime Minister Manmohan Singh to save the Ganga and make it pollution-free at the earliest. Initiating the debate, SP member Rewati Raman Singh demanded dismantling of all man-made dams on the Ganga. “I demand that the Prime Minister should intervene to save the Ganga which is not just a river but our lifeline and part of our culture,” he said.