Leading the campaign, Dr Anil P Joshi, founder of the Dehradun-based NGO HESCO, called for a separate ministry at the centre on the Himalayan region

Environmentalists renewed their campaign against big dams on Monday and called for formulating a new sustainable developmental model for the entire Himalayan region in the wake of the June disaster in Uttarakhand that left hundreds of people dead and devastated scores of hydel projects.