In 1957,Dave Keeling used new sensitive instruments to begin to A) measure aspects of the global nitrogen cycle. B) obtain accurate measurements of atmospheric CO₂. C) estimate the extent of nitrogen fixation by microbes. D) determine the effects of greenhouse warming on Hadley cells. E) establish the connection between CO₂ and the greenhouse effect.

Question

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Dave Keeling began to obtain accurate measurements of atmospheric CO₂ (carbon dioxide) using new sensitive instruments in 1957. His work contributed to the understanding of the role of carbon dioxide in the greenhouse effect and global warming.

In 1957,Dave Keeling Used New Sensitive Instruments to Begin to