Reckless destruction of natural resources has posed a grave threat to the environment, and the role of forest officers is crucial in preserving the environment, President Pranab Mukherjee said on Friday.Interacting with a group of Indian Forest Service probationers of the 2015-17 batch, the President said the demands of development need to be balanced with conservation and preservation of environment. “Many years ago, Mahatma Gandhi had pointed out that the world has enough for everyone's need, but not enough for everyone's greed. The whole world has recognized the danger caused to humanity due to destruction of natural resources and also the need to address the grave issue,” he said. The President told the probationers, including two trainees from Bhutan, that it was their responsibility to preserve and protect forests and conserve the depleting resources. While congratulating the probationers for successfully qualifying one of the most difficult competitive examinations in the country, he advised them to do their job to the best of their ability.