Releasing his book "Sariska: The Tiger Reserve Roars Again", which reveals a unique experiment of shifting tigers from Ranthambore to Sariska for their conservation as a first of its kind initiative in the world, Sharma said that the poaching could have been stopped with proper intervention by the government.
"The tigers started disappearing in 2002 because of large scale poaching and by 2004 they were all gone," he said, adding that poachers had even made "machans" in and around the area to hunt.
Restoration of tigers in Sariska Wild Sanctuary was India's first leap of success in conserving the national animal, Ravi Singh Secretary General WWF said.
"Sariska is the place where the Project Tiger was started first. We faced a lot of difficulties and resistance in shifting tigers as it was first such thing happening anywhere in the world. The grand success of it created ripples the world," he said.
"The tigers are still vulnerable. They can disappear again as we have not been able to tackle the problem," he said.