Environmental pollution is a global problem and _____(1)______ threat to human survival. The causes of pollution are quite ______(2)______, such as contamination of water, cutting of trees and forests, emission of toxic gases etc. Due to ______(3)______ factors, the flora and fauna are adversely affected. An awareness to protect the environment is everybody’s ______(4)______ duty and we should collectively come forward for this noble campaign. Government is taking strong ______(5)______ to check the menace of pollution.