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Keeling's Reports from Mauna Loa Demonstrated ____________

Question 33

Multiple Choice

Keeling's reports from Mauna Loa demonstrated ____________


A) that as distances from cities decreased, CO2 concentrations increased
B) that CO2 levels have been stable over the last 40 years
C) an increase in tropospheric CO2 from the 1950s to present
D) the presence of El Niño
E) that sediments deposited on the seafloor can yield clues about past climates

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