1. River argued, "Garbage left behind around Mount Everest by past climbers now poses a serious threat to the environment and a hazard to other clombers." (4)
2. Accorfing to United Nations Environment Programme, major environmental problems caused by rourism include the depletion of natural resources, pollution, and various physical damages caused by construction and tourist acrivities. (5-6)
3. Farber stated, "It is a Failure of imagination that we fumans cannot see value in animals beyond their use to us as food or entertainment." (qtd. in convertino 27)
4. Every year, an estimated 25 million vertebrate animals are used for the purpose of research, experiment and education is the U.S. ("Frequently Asked Questions about Animals in Research")
5. A United Nations report stated that approximately 25% of the mammals and 12% of the virds in the world might become extinct during the next few decades due to global warming. (qtd. in Schultz)
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