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.

Earth's CO2 Home Page

CLICK HERE for daily CO2Now data updates.






Atmospheric CO2 for August 2015

preliminary monthly average

Mauna Loa Observatory (NOAA-ESRL)


NOTE:  On May 10, 2013, NOAA & Scripps first reported daily averages that temporarily reached 400 ppm.

Atmospheric CO2 data and trend  

CO2 Data Set:

Original CO2 data files dated:  Monday September 7, 2015 (NOAA)

Measuring Location:

Mauna Loa Observatory, Hawaii


Why is CO2 significant?
Carbon dioxide (CO2) is the chief greenhouse gas that results from human activities and causes global warming and climate change. To see whether enough is being done at the moment to solve these global problems, there is no single indicator as complete and current as the monthly updates for atmospheric CO2 from the Mauna Loa Observatory.
What is the current trend?
The concentrations of CO2 in the atmosphere are increasing at an accelerating rate from decade to decade.   The latest atmospheric CO2 data is consistent with a continuation of this long-standing trend.
What level is safe?
The upper safety limit for atmospheric CO2 is 350 parts per million (ppm). Atmospheric CO2 levels have stayed higher than 350 ppm since early 1988.


This atmospheric CO2 is one of four planetary boundaries that have been surpassed.   Read more about the earth's climate boundary and others at the Stockholm Resilience Centre.


Annual Data | Atmospheric CO2

annual mean co2

Annual Atmospheric CO2 DataThe 2014 average annual concentration of CO2 in the atmosphere (Mauna Loa Observatory) is 398.55 parts per million (ppm).   The 2013 average is 396.48 ppm.  

For the past decade (2005-2014) the average annual increase is 2.1 ppm per year.  The average for the prior decade (1995-2004) is 1.9 ppm per year.    Annual data for 2014 was first posted January 6, 2015, by NOAA-ESRL in the United States. 

Since the 1958 start of high-precision instrument measurements of CO2 in the atmosphere, the annual mean concentration of CO2 has only increased from one year to the next.   The CO2 data below provide a simple view of the annual trend. 

Current Data for Atmospheric CO2

The world's most current data for atmospheric CO2 is measured at the Mauna Loa Observatoy in Hawaii.  Measurements are made and reported independently by two scientific institutions:  Scripps Institution of Oceanography and the National Oceanic and Atmospheric Administration (NOAA).  Monthly data is posted below.   

Mauna Loa CO2 Data Sets:

    Monthly     NOAA CO2 Data
    Weekly        NOAA CO2 Data

    Monthly    Scripps CO2 Data
Scripps CO2 Data

Global Temperature Update


May 20, 2015

Globally, April 2015 marks the 4th highest surface temperature for April since global temperature records began in 1880.  The coolest on record is April 1909. [NOAA Global Monthly Analysis--Temperature]


Recent News:

2015 Hottest Year to Date, Could Top 2014 Record  [Climate Central


"The science is sobering—the global temperature in 2012 was among the hottest since records began in 1880. Make no mistake: without concerted action, the very future of our planet is in peril."

~ Christine Lagarde, Managing Director
International Monetary Fund


Accelerating Rise of Atmospheric CO2


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.  

High Resolution CO2 Graphics

High Resolution CO2 Graphics 

Show the latest readings for atmospheric CO2 far and wide--and update them very month.   Since 2008, has been helping webmasters show the rising CO2 trend with CO2Now website widgets.  

As of 2014, high-resolutions versions of the widget graphics are now available for use by anyone, anywhere.  Use the graphics to show the CO2 numbers and trend in your media presentations, printed posters, newsletters, or books. Download the graphics here...

Global Carbon Emissions

Global Carbon Budget 2010

Global CO2 Budget 2014 posted data for the 2014 Global Carbon Budget on September 21, 2014.  Some key findings are set out below:

*In 2013, global CO2 emissions due to fossil fuel use (and cement production) were 36 gigatonnes (GtCO2); this is 61% higher than 1990 (the Kyoto Protocol reference year) and 2.3% higher than 2012.

*In 2014, global CO2 emissions are projected to increase by an additional 2.5% over the 2013 level.  

*CO2 emissions were dominated by China (28%), the USA (14%), the EU (10%), and India (7%)--with growth in all of these states except for a 1.8% decline in the EU (28 member states). 

*The 2013 carbon dioxide emissions (fossil fuel and cement production only) breakdown is: coal (43%), oil (33%), gas (18%), cement (5.5%) and gas flaring (0.6%).

*Emissions from land use change accounts for 8% of total CO2 emissions; the data suggests an overall decreasing trend in land use change emissions particularly since 2000.

*Key Sources:   CDIAC 2013 Global Carbon Budget

>>>>  Links to the source data, credits and high-resolution images are given below.