Exam 23: The Human Impact of Earths Environment

"Black lung" is an occupational hazard for miners of

Approximately what was the population doubling time in the 1950s?

An impermeable barrier that prevents oil and natural gas from migrating to Earth's surface is called a(n)

A British thermal unit (Btu)is the amount of energy needed to

Global change induced by human activity is referred to as _________ change.

What was population of Earth at the beginning of the Holocene epoch?

Approximately _____ of the electrical energy used by the United States is supplied by nuclear power.

Burning coal that contains the mineral pyrite contributes to the addition of ______ to the atmosphere.

Hydroelectric energy uses _______ to produce electricity.

Which of the following has the lowest Btu?

The number of very strong hurricanes has increased by ____ in the past three decades.

The Montreal Protocol is responsible for

Natural gas emits ____ less carbon dioxide per unit of energy than oil.

Methane gas is also referred to as

Excessive exposure to ultraviolet (UV)radiation can cause

Humans have converted approximately one-third of the world's forested area to land use for

Atmospheric chemist Paul Crutzen proposed that a new geologic epoch be named the _____ to cover from the beginning of the Industrial Revolution to the present.

In the last half-century humans have converted roughly _______ of forested land to other land use.

Which climate system(s)is(are)most affected by the burning of fossil fuels?

_____ is the ultimate clean fuel.