The aftermath of Bhopal’ gas tragedy in 1984 had caused 558,125 injuries, including 38,478 temporary partial injuries and approximately 3,900 severely and permanently disabling injuries. Other estimate that 8,000 died within two weeks, and another 8,000 or more have died since from gas-related disease. These are examples of the aftermath of disasters that effect on human. The lesson learnt from this study is __________.