Atmospheric CO2 is accelerating upward from decade to decade.
For the past ten years, the average annual rate of increase is 2.07 parts per million (ppm). This rate of increase is more than double the increase in the 1960s.
See the table below.
Decade Total Increase Annual Rate of Increase
2004 – 2013 20.71 ppm 2.07 ppm per year
1994 – 2003 18.70 ppm 1.87 ppm per year
1984 – 1993 14.04 ppm 1.40 ppm per year
1974 – 1983 13.35 ppm 1.34 ppm per year
1964 – 1973 10.69 ppm 1.07 ppm per year
1960 – 1963 3.02 ppm 0.75 ppm per year (4 years only)
the Industrial Revolution in the 19th century, global average CO2 was
about 280 ppm. During the last 800,000 years, CO2 fluctuated between
about 180 ppm during ice ages and 280 ppm during interglacial warm
periods. Today’s rate of increase is more than 100 times faster than the
increase that occurred when the last ice age ended.
~ NOAA Media Release "Carbon Dioxide...Tops 400 ppm" (2013)
is calculated by CO2Now using measurements of the concentration of CO2
in the atmosphere (Mauna Loa Observatory) that were made and posted by
the Scripps Institution of Oceanography's CO2 Program.
CO2Now | Data for atmospheric CO2 (Mauna Loa Observatory)
CO2Now | Global carbon emissions
CO2Now | Annual CO2 concentrations
CO2Now | Global temperature
CO2Now | The Climate Sheet: More "Big Picture" Data
The Conversation | Existential risks to our planetary life-support systems (2013)