IN CONTEXT

KEY FIGURE

Charles Keeling (1928–2005)

BEFORE

1896 The Swedish chemist Svante Arrhenius is the first to estimate the extent to which atmospheric CO2 could increase Earth’s temperature.

1938 Comparing historic temperature data and CO2 measurements, the British engineer and scientist Guy Stewart Callendar concludes that the increase in CO2 is responsible for the warming of the atmosphere.

AFTER

2002 The European Space Agency’s ENVISAT satellite begins to produce up to 5,000 readings of greenhouse gases every day.

2014 NASA’s Orbiting Carbon Observatory generates up to 100,000 high-precision measurements daily.

The Keeling Curve, named ...

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