<Li> Alternative environment - friendly sources of fuel energy such as biogas other than wood should be used . </Li> <Li> Loss of biodiversity due to forest fire is a major problem, immediate steps to prevent forest fire need to be taken . </Li> <Li> Overgrazing by cattle can damage a forest seriously . Therefore, certain steps should be taken to prevent overgrazing by cattle . </Li> <Li> Hunting and poaching should be banned . </Li>

Which one of the following statements refers to biodiversity