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 March 2015

Preliminary monthly average

2 Independent Data Sources: Scripps Institution of Oceanography & NOAA-ESRL

Mauna Loa Observatory


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:  April 4 & 6 2015 (Scripps & 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.


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

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.  

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.

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 Temperature Update


October 22, 2014

Globally, September 2014 was the warmest September since global temperature records began in 1880.  The coolest on record is September 1912. [NOAA Global Monthly Analysis]

Annually, 2013 tied 2003 as the 4th warmest year globally since 1880.  Nine of the ten warmest years in the past 134 years occurred since the Year 2000.  Only one year during the 20th Century--1998--was warmer than 2013.  [NOAA Global Analysis 2013]


Recent News:

September was Warmest on Record, NASA Data Shows [Climate Central]

NASA ranks August 2014 as the warmest August on 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


Scientists Are Speaking


Scientists are speaking.  97 of them.  Since September 7, 2014, the founder of, John Cook, has been releasing quotes by distinguished scientists from around the world.  One each hour.   The quotes (and graphics) are on the SkepticalScience twitter feed and website.  Here is one that John produced...number 42 of 97...featuring the words and drawing of Professor Eric Wolff...

'Quote Graphic' from 

Scientists are saying that global warming is happening.   That it's caused by certain human activities.  And that impacts are very large and very long-term.  Lots of them are saying these things.  Almost all of them are.  But rather than rely on this summation, see what scientists are saying in their own words.  Notice who is saying it.  If you agree with us that others should hear what these eminent scientists are saying,you are welcome to retweet or link or repost.  It all helps to inform and expand the conversation....