EOC_ch08

Essential Environment: The Science behind the Stories (3rd Edition)

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 8 Testing Your Comprehension 1 The human global population is approximately 6.7 billion people, with about 220,000 added daily. 2 In many cases, humans have been able to substitute one resource for another, thereby avoiding environmental limitations at least temporarily. As to how long this can be sustained, answers will vary. 3 Environmental scientists are generally convinced that the effects of resource limitation cannot be avoided forever (i.e., that resources are not infinitely substitutable). Cornucopians take the opposing view. Population growth is a problem to the extent that it leads to crowding, resource depletion, reduced standards of living, and environmental degradation. 4 The IPAT model says that our I mpact on the environment is a function of P opulation size, per capita A ffluence, and our T echnological choices. Technology can either increase or decrease I mpact— for example, choosing a bicycle versus a sport utility vehicle as a transportation technology, or choosing a compact fluorescent lighting fixture versus an incandescent one. 5 Demographers study population size, density, distribution, age structure, sex ratio, and rates of birth, death, immigration, and emigration. Each of these help determine our environmental impact, because they all affect
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 10/30/2010.

Page1 / 2

EOC_ch08 - Chapter 8 Testing Your Comprehension 1 The human global population is approximately 6.7 billion people with about 220,000 added daily 2

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online