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The following shows the approximate concentration of CO2, N2, and O2 in dry air are

<1% 78% 21%

by the year 2050 world population is expected to approach 10 billion. if the current population trends continue, the region that will experience the majority of the growth is

Africa and Asia

The drop in stratospheric ozone levels in the Southern Hemisphere (the "ozone hole") is most evident during which season

Antarctic spring (October)

Which of the following world regions contain the greatest area of rain forest?

Brazil and Indonesia

Which of the following is a major goal of the program begun in 1995 to reintroduce the gray wolf into Yellowstone National Park?

Enable the removal of grey wolf from endangered list

the use of which of the following to control agricultural insect pests is most likely to have a negative and persistent impact on an ecosystem is

Lindane, a chlorinated hydocarbon

A state highway was constructed over wetlands. The state obtained a permit to fill the existing wetlands in accordance with the provisions of the Clean Water Act of 1972, and agreed to create another wetland. This tradeoff approach to addressing an environmental issue is known as

Mitigation

The water-holding capacity of soil is LEAST likely to be affected by the addition of which of the following

Pesticide

What two main factors would best indicate the quality of life of a country's population?

The life expectancy and the infant mortality rate

Which of the following will occur if the trend of global temperature increase continues?

The troposphere will contain more water vapor

Smoke from forest fires is likely to affect air quality over larger areas for many days when

a persistent atmospheric inversion ecists in the region.

sustainable use of forests in the united states would likely be encouraged by

cutting small groups of medium- and large sized trees in uneven-aged forests

Alligators in a Florida lake polluted by high levels of dioxins (chlorinated hydrocarbons) had low testosterone levels and failed to reproduce. Scientists came to the conclusion that the dioxins were acting as which of the following?

endocrine disrupters****

two of the major effects of overgrazing are

erosion and dertifications

rachel carson's contributions to the environmental movement include

increasing public awareness of the risks of using pesticides

Which of the following is a point source of water pollution?

offshore oil wells

the significance of the United Nations Conference on the Human Environment, which was held 1972 in Stockholm?

the conference provided the first global forum for dialogue on environmental problems

maximum sustainable yield

the size of a natural population at which it produces a maximum rate of increase, typically at half the carrying capacity.

The major source of radon in houses in the United States is

underlying bedrock