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