How things work college course/Global warming quiz 3

The unshuffled version can serve as a pre-reading activity for the Wikipedia article, Global warming (permalink)

See Global warming quizzes for other quizzes devoted to this article. This quiz covers initial causes of temperature changes and external forcings version.

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Global Warming quiz 3-Initial causes of temperature changes and external forcings

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1 The "Greenhouse effect schematic" in the section on "Temperature changes..." indicates that most of the energy from the Sun is absorbed by the earth's atmosphere.

	true
	false

2 The "Greenhouse effect schematic" in the section on "Temperature changes..." indicates that most of the energy from the Sun is absorbed at the earth's surface.

	true
	false

3 Which external force plays the smallest role in current efforts to model global warming?

	greenhouse gasses
	solar luminosity (i.e. variations in energy from the sun)
	volcanic eruptions
	orbital cycles

4 "External forcings" refer to effects that can increase, but not decrease, the Earth's temperature.

	true
	false

5 "External forcings" refer to effects that can either increase or decrease, the Earth's temperature.

	true
	false

6 Water vapor contributes more to the greenhouse effect than does carbon dioxide.

	true
	false

7 Carbon dioxide contributes more to the greenhouse effect than does water vapor.

	true
	false

8 The Keeling curve shows that carbon dioxide concentrations

	show a steady rise in CO2 levels, with increasing slope, and regular and predictable annual fluctuations
	show a steady rise in CO2 levels, at constant slope, and regular and predictable annual fluctuations
	show a steady rise in CO2 levels, at constant slope, and irregular fluctuations due associated with El Ninos and La Ninas.

9 The climate change community is divided between those who believe the goal should be to eliminate the earth's greenhouse effect altogether, and those who argue that we should attempt to minimize earth's greenhouse effect.

	true
	false

10 Emissions scenarios are

	estimates of changes in future emission levels of greenhouse gases
	estimates of how greenhouse gasses are absorbed and emitted by nature
	estimates of how greenhouse gasses are absorbed and emitted by the world's oceans
	estimates of how greenhouse gasses are absorbed and emitted by agriculture

11 It is expected that carbon emissions will begin to diminish in the 21st century as fossil fuel reserves begin to dwindle.

	true
	false

12 The carbon cycle

	is a proposal to trade carbon credits.
	describes how carbon is absorbed and emitted by the oceans, soil, plants, etc.
	is an effort to store carbon in underground caves.

13 Global dimming, caused by air-born particulates produced by volcanoes and human made pollutants

	exerts a heating effect by absorbing infra-red radiation from earth's surface
	is more related to the ozone problem than to global warming
	exerts a cooling effect by increasing the reflection of incoming sunlight

14 Soot tends to warm the earth when it accumulates in atmospheric brown clouds.

	true
	false

15 Soot tends to cool the earth when it accumulates in atmospheric brown clouds.

	true
	false

16 In the arctic, soot tends to cool the earth.

	true
	false

17 In the arctic, soot tends to warm the earth.

	true
	false

18 Approximately what percent of global warming can be attributed to a long-term trend (since 1978) in the sun's energy?

	50%
	0%
	10%
	30%

19 Greenhouse warming acts to cool the stratosphere

	true
	false

20 Greenhouse warming acts to warm the stratosphere

	true
	false

21 The distinction between the urban heat island effect and land use changes is that the latter involves the earth's average temperature while the former involves only the temperature near weather stations where the measurements are made

	true
	false

22 Depleting the ozone layer cools the stratosphere because ozone allows UV radiation to penetrate.

	true
	false

23 Depleting the ozone layer cools the stratosphere because ozone absorbs UV energy from the sun that heats the stratosphere.

	true
	false