The water vaporgreenhouse feedback represents a positive feedback mechanism.
a. True
b. False
Q. 2Changes in the circulation patterns of the ocean and atmosphere, which redistributes energy within the climate system, is an example of an external cause of climate change.
a. True
b. False
Q. 3Most of the recent global warming is due to an enhanced greenhouse effect caused by increasing levels of greenhouse gases, such as CO2.
a. True
b. False
Q. 4An increase of 0.85C is insignificant when compared with temperature changes over thousands of years.
a. True
b. False
Q. 5A warm spell called the Blling-Allerd period occurred about 6,000 years ago.
a. True
b. False
Q. 6The most recent North American glaciers reached their maximum thickness and extent between about 26,000 and 20,000 years ago (Ya).
a. True
b. False
Q. 7Throughout much of Earths history, the global climate was probably much warmer than it is today.
a. True
b. False
Q. 8Examining the boron-isotope ratio in ancient ice cores provides a past record of temperature trends.
a. True
b. False
Q. 9According to the 2013 Fifth Assessment Report of the IPCC, the primary source of the increased atmospheric concentration of carbon dioxide since the pre-industrial period results from ____________________ use, with land-use change providing another significant but smaller contribution.
Fill in the blank with correct word.
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