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WGU D199 Questions and Verified Answers (2024 / 2025) 100% Guarantee Pass
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WGU D199 Questions and Verified Answers (2024 / 2025) 100% Guarantee Pass
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D199 WGU.pdf file:///C:/Users/HP/Desktop/New%20folder%20(4)/D199%20WGUWGU D199 Questions & Answers
1. in the last 10,000 years
Answer humans began modifying the land surface for growing food with advent of agricultural
revolution
2. the agricultural revolution roughly
Answer coincides with a warm interglacial period that began about 11,700 years ago which is
called the HOLOCENE era (warm stable climate)
3. the last 270 years of the holocene ushered into the
Answer INDUSTRIAL REVOLU- TION when climate pollution began to increase dramatically
4. the industrial revolution was powered by
Answer fossil fuels
5. what began after world war II?
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Answer the great acceleration (1950-present)
-caused depletion in the ozone layer
-After 1950, the biodiversity of species started decreasing and the extinction of species accelerated
6. The Great Acceleration marks the beginning of
Answer Homo sapiens' truly massive global imprint on the planet
-The climate has already warmed by 1°C since 1900.
-If humans continue with business-as-usual consumption of fossil fuels, the warming between
1900 and 2100 could exceed 4°C.
7. the greenhouse effect.
Answer It is this trapping of heat energy that otherwise would have escaped to space through
the atmosphere
-allows solar radiation to enter
-the blanket effect
8. is the greenhouse effect real?
Answer -Satellites routinely measure the incoming solar energy and the outgoing heat energy
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from the planet
-Independently, the heat energy emitted by the surface has been estimated using observed
surface temperatures on land and sea.
9. aerosols
Answer -Visible smoke and smog are made up of tiny particles
-carbon dioxide and other greenhouse gases cannot be seen by the human eye
-Most of these aerosols reflect sunlight and have a cooling effect
10. black carbon aerosols (a major component of soot)
Answer -absorb solar radiation entering the atmosphere and have a warming effect.
-warms the climate by absorbing solar energy rather than infrared energy from the planet
11. super pollutants
Answer -non-carbon dioxide greenhouse gases and black carbon particles
-per molecule, their warming effects are much larger than that of carbon dioxide.
12. The Northern Hemisphere has warmed more than the Southern Hemi- sphere,
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