Utilitarian Justification sees some aspect of the environment as valuable because it benefits individuals economically or is directly necessary to human survival.
Ecological Justification is when an ecosystem is necessary for the survival of some species of interest to us, or that the system itself provides some benefit.
Aesthetic Justification is our appreciation if the beauty of nature. We save nature because it makes us feel good to see it.
Recreational Justification is when people use wilderness for recreation.
Inspirational Justification that conservation of nature can be based on its benefits to the human spirit.
Creative Justification is when nature is added to human creativity.
Moral Justification has to do with the belief that various aspects of the environment have a right to exist and that it is our moral obligation to allow them to continue or help them persist.