Chapter 1 Review

Which of the following events has increased the impact of humans on the environment? 
I. Advances in technology
II. Reduced human population growth
III. Use of tools for hunting

• I only
• II and III 
• I and III
• I, II and III

As described in this chapter, environmental indicators

• always tell us what is causing an environmental change. 
• can be used to analyze the health of natural systems. 
• are useful only when studying large-scale changes.
• do not provide information regarding sustainability. 

Which statement regarding a global environmental indicator is not correct? 

• For the past 130 years, average global surface temperatures have shown an overall increase that seems likely to continue. 
• World population is expected between 8.1 billion and 9.6 billion by 2050. 
• World grain production has increased fairly steadily since 1950, but worldwide production of grain per capita has decreased drastically over the same period. 
• Concentrations of atmospheric carbon dioxide have been rising quite steadily since the Industrial Revolution. 

The measured concentration of CO₂ in the atmosphere is an example of

• a sample of air from over the Antarctic.
• an environmental indicator. 
• replicate sampling. 
• calculating an ecological footprint. 

In science, which of the following is the most certain? 

• Idea
• Hypothesis
• Observation
• Natural Law

All of the following would be exclusively caused by anthropogenic activities except

• forest fires.
• combustion of fossil fuels. 
• forest clearing for crops. 
• air pollution from burning oil. 

The populations of some endangered animal species have stabilized or increased in numbers after human intervention. An example of a species that is still endangered and needs further assistance to recover is the

• bald eagle. 
• snow leopard. 
• American bison. 
• American alligator.