Rivers said that 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 Everest Makeover", 4)
According to the United Nations Environment Programme, major environmental problems caused by tourism include the depletion of natural resources, pollution, and various physical damages caused by construction and tourist activities. (5-6)
ULCA 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, 27)
Every year, an estimated 25 million vertebrate animals are used for the purpose of research, experiment and education in the U.S. ("Frequently Asked Questions about Animals in Research")
According to a United Nations report, approximately 25% of the mammals and 12% of the birds in the world might become extict during the next few decades due global warming. (qtd. in Shultz)
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