Contaminated ground water and excessive use of pesticides could be the reason behind the premature greying of a Bathinda village in Punjab. Dr Ashutosh Halder, professor at the department of reproductive biology, AIIMS, who was leading the team of experts in the villages during an awareness campaign launched by an NGO Kheti Virasat, says the problems including premature ageing were due to the genetic (DNA) damage and attributed their incidence to toxic environmental factors.