21. A frontier ethic assumes Answers A. that the Earth has an unlimited supply of resources. B. humans are a part of the natural environment. C. high population growth and advanced technology. D. that the Earth has a limited supply of resources that must be protected. Question22. The late economist Julian Simon said that continued population growth will result in Answers A. a poor standard of living. B. a population crash. C. a better standard of living. D. global warming. Question23. Which of the following would be an assumption of frontier ethics? Answers A. We should use our resources carefully, so that future generations can enjoy them as well. B. If we run out of one resource, we will be able to invent a substitute. C. We need to understand interactions among living things. D. Other living things have inherent value. Question24. Which preservationist was the founder of the Sierra Club and led the fight against the dam in the Hetch Hetchy Valley? Answers A. John Muir B. Gifford Pinchot C. Teddy Roosevelt D. Aldo Leopold