Question

8,000 Total Petroleum Coal Natural gas Cement production Netflux into the atmosphere (total emissions - amount absorbed by sinks) 6,000 4,000 Carbon million metric tons/year) 2,000 1800 1850 1950 1900 Year 2000 Using the graph, determine which year humans first started producing more carbon than could be absorbed by carbon sinks. Choose one: O 1905 1850 O 1970 1900

Answer 1

The correct answer is 1905 A carbon sink is anything that absorbs more carbon from the atmosphere than it releases.

Carbon dioxide and other greenhouse gases trap heat in our atmosphere, warming it and altering the temperature of the planet. Scientists concur that since the advent of fossil fuels in the 1860s, human activities have been the main cause of the observed increase in atmospheric carbon dioxide. Humans have made substantial changes to the global carbon cycle since the beginning of the Industrial Age more than 250 years ago, mostly via the burning of fossil fuels but also through disruptions to the natural carbon cycle. One illustration is the extensive conversion of forests into farmland and rangeland. Carbon dioxide levels in the atmosphere have risen steadily as a result of the use of more and more fossil fuels, including coal, oil, and eventually gas.

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