Question

Keeling's reports from Mauna Loa demonstrated ________.

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

Answer 1

Keeling's reports from the Mauna Loa Observatory demonstrated an increase in atmospheric CO2 levels from the 1950s to the present, a trend that has become a cornerstone in the understanding of human-induced climate change.

Step-by-step explanation:

Keeling's reports from Mauna Loa demonstrated an increase in tropospheric CO2 from the 1950s to present. Dave Keeling's measurements, starting in 1958 at the Mauna Loa Observatory, have depicted a consistent rise in atmospheric carbon dioxide levels, known as the Keeling Curve.

This data has been critical in showing the trend of rising CO2 levels in relation to human activities such as the burning of fossil fuels.