Which one of the following trees is considered to be an environmental ...........

Explanation:

Eucalyptus is considered as environmental hazard due to various reasons. Eucalyptus is responsible for replacing indigenous forests in several parts of the world, depleting food and shelter sources and therefore affecting  animals  and birds. Growing Eucalyptus in low rainfall areas may cause adverse environmental impacts due  to  competition  for water with other species. Hence option 4th is correct.