Yoga guru Swami Ramdev will now play a key role in the campaign to save the Ganga river, which is being spearheaded by the Ganga Raksha Manch. The Yoga guru and other sadhus participating in the campaign to save the Ganga will use the mala (garland) and the bhala (trident) to convince people to join in. "With the mala, we will welcome people to contribute and do shramdaan in the campaign and with the bhala we will impress upon them the cultural, religious and national significance of the Ganga river," a spokesman of the Ganga Raksha Manch told this correspondent on Friday.