1. Jeremy Fivers said in "A Mount Everest Makeover" that garbage left behind around Mount Everest by past climbers now poses a serious threat to the environment and a hazard to other climbers.(page. 4)
2. United Nations Environment Programme said at Environmental Impacts of Tourism that major environmental problems of tourism include the depletion of natural resources, pollution, and various physical damages caused by construction and tourist activities. (page. 5-6)
3. John Covertino said that UCLA biologist Pat Farber said that it is a failure of imagination that we humans cannot see value in animals beyond their use to us as food or entertainment ("How We See Animals, How We See Ourselves", page. 27)
4. "Frequently Asked Questions about Animals in Research" of Animals in Research said that Every year, an estimated 25 million vertebrate animals are used for the purpose of research, experiment and education in the U.S.
5. Roberta Schultz said in "An Endangered Planet" that .According to a United Nations report, approximately 25% of the mamamls and 12% of the birds in the world might become extinct during the next few decades due to global warming. (qtd. in Schultz)
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