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.
Identify the most appropriate option to substitute the underlined segment. If no substitution is required, select No substitution. The shoebill stork can be recognise from its long legs and broad wings.