CO2 Now


What the world needs to watch

Global warming is mainly the result of CO2 levels rising in the Earth’s atmosphere. Both atmospheric CO2 and climate change are accelerating. Climate scientists say we have years, not decades, to stabilize CO2 and other greenhouse gases.

To help the world succeed, makes it easy to see the most current CO2 level and what it means. So, use this site and keep an eye on CO2.  Invite others to do the same. Then we can do more to send CO2 in the right direction.

Watch CO2 now and know the score on global warming, practically in real time.

Accelerating Rise of Atmospheric CO2 PDF Print E-mail


Accelerating CO2 TrendAtmospheric CO2 is accelerating upward from decade to decade.   

For the past ten years (2005 - 2014), the average annual rate of increase is 2.11 parts per million (ppm).   This rate of increase is more than double the increase in the 1960s.   

See the table below.  



Decade                 Total Increases       Average Annual Rates of Increase

2005 –  2014              21.06 ppm                     2.11 ppm per year 

1995 –  2004               18.67 ppm                     1.87 ppm per year 

1985 –  1994                14.24 ppm                     1.42 ppm per year 

1975 –  1984               14.40 ppm                     1.44 ppm per year 

1965 –  1974               10.56 ppm                     1.06 ppm per year 

1960 –  1964                 3.65 ppm                     0.73 ppm per year (5 years only)

Before 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)


Why  is the atmospheric concentration of CO2 increasing at an accelerating rate?  Research suggests that it is because fossil fuels are being burned at an enhanced rate, the ending of the long-term trend of increasing carbon efficiency of economies, and the ocean's diminishing absorption of CO2 (Canadell et al., 2007).


Source Data:

Data 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.


Canadell, J. G., Quéré, C. L., Raupach, M. R., Field, C. B., Buitenhuis, E. T., Ciais, P., . . . Marland, G. (2007). Contributions to accelerating atmospheric CO₂ growth from economic activity, carbon intensity, and efficiency of natural sinks. Proceedings of the National Academy of Sciences of the United States of America, 104(47), 18866-18870. doi: 10.2307/25450516


Related Information:

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)

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