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

Multiple Choice

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.