Early action to reduce emissions would result in strong economic growth.

Early action to reduce emissions would result in strong economic growth.

Global Carbon Project figures

A factsheet detailing the 2007 data for the Global Carbon Project, a joint international project on the global carbon cycle.

  • 26 September 2008 | Updated 14 October 2011

The Global Carbon Project (GCP) is sponsored by the International Geosphere-Biosphere Programme (IGBP), the International Human Dimensions Programme on Global Environmental Research (IHDP), and the World Climate Research Program.

The latest figures on the global carbon budget released in Washington and Paris indicate a four-fold increase in growth rate of human-generated carbon dioxide emissions since 2000.

Key figures released include:

Atmospheric CO2 growth

Annual mean growth rate of atmospheric CO2 was 2.2 ppm per year in 2007 (up from 1.8 ppm in 2006), and above the 2.0 ppm average for the period 2000-2007. The average annual mean growth rate for the previous 20 years was about 1.5 ppm per year.

This increase brought the atmospheric CO2 concentration to 383 ppm in 2007, 37 per cent above the concentration at the start of the industrial revolution (about 280 ppm in 1750). The present concentration is the highest during the last 650,000 years and probably during the last 20 million years. [ppm =  parts per million].

Emissions from land use change

Land use change was responsible for estimated net emissions of 1.5 PgC per year to the atmosphere. This is largely the difference between CO2 emissions from deforestation and CO2 uptake by reforestation.

Emissions for 2006 and 2007 were extrapolated from the previous 25-year trend of 1.5 PgC per year. Land use change emissions come almost exclusively from deforestation in tropical countries with an estimated 41 per cent  from South and Central America, 43 per cent from South and Southeast Asia, and 17 per cent  from Africa. An estimated 160 PgC were emitted to the atmosphere from land use change during the period 1850-2007 [1 Pg = 1 billion tons or 1000 x million tons]. 

Emissions from fossil fuel and cement

Emissions increased from 6.2 PgC per year in 1990 to 8.5 PgC in 2007, a 38 per cent  increase from the Kyoto reference year 1990. The growth rate of emissions was 3.5 per cent  per year for the period of 2000-2007, an almost four fold increase from 0.9 per cent per year in 1990-1999.

The actual emissions growth rate for 2000-2007 exceeded the highest forecast growth rates for the decade 2000-2010 in the emissions scenarios of the Intergovermental Panel on Climate Change, Special Report on Emissions Scenarios (IPCC-SRES). This makes current trends in emissions higher than the worst case IPCC-SRES scenario. Fossil fuel and cement emissions released approximately 348 PgC to the atmosphere from 1850 to 2007.

Regional fossil fuel emissions

The biggest increase in emissions has taken place in developing countries, largely in China and India, while developed countries have been growing slowly. The largest regional shift was that China passed the U.S. in 2006 to become the largest CO2 emitter, and India will soon overtake Russia to become the third largest emitter. Currently, more than half of the global emissions come from less developed countries.

From a historical perspective, developing countries with 80 per cent  of the world’s population still account for only 20 per cent  of the cumulative emissions since 1751; the poorest countries in the world, with 800 million people, have contributed less than per cent of these cumulative emissions.

Carbon intensity of the economy

After decades of improvements, the carbon intensity of the global economy, the carbon emitted per unit of Gross Domestic Product (GDP), was stalled during the period 2003-2005. This change was largely caused by China’s rapidly growing share in economic output and carbon emissions.

Since 2005 China’s energy intensity (which underpins carbon intensity) has decreased (improved) by 1.2 per cent  in 2006 and 3.7 per cent  in 2007 compared to 2005 levels (according to the National Energy Administration in China).

CO2 removal by natural sinks

Natural land and ocean CO2 sinks have removed 54 per cent  (or 4.8 PgC per year) of all CO2 emitted from human activities during the period 2000-2007.

The size of the natural sinks has grown in proportion to increasing atmospheric CO2. However, the efficiency of these sinks in removing CO2 has decreased by 5 per cent  over the last 50 years, and will continue to do so in the future. That is, 50 years ago, for every ton of CO2 emitted to the atmosphere, natural sinks removed 600 kg. Currently, the sinks are removing only 550 kg for every ton of CO2 emitted, and this amount is falling.

Natural ocean CO2 sinks

The global oceanic CO2 sink removed 25 per cent  of all CO2 emissions for the period 2000-2007, equivalent to an average of 2.3 PgC per year. The size of the CO2 sink in 2007 was similar to that in the previous year but lower by 0.1 PgC compared to its expected increase from atmospheric CO2 growth. This was due to the presence of a La Nina event in the equatorial Pacific.

The Southern Ocean CO2 sink was higher in 2007 compared to 2006, consistent with the relatively weak winds and the low Southern Annular Mode (a circumpolar pressure oscillation between Antarctica and southern mid-latitudes). An analysis of the long term trend of the ocean sink shows a slower growth than expected of the CO2 sink over the last 20 years.

Natural land CO2 sinks

Terrestrial CO2 sinks removed 29 per cent  of all anthropogenic emissions for the period 2000-2007, equivalent to an average of 2.6 PgC per year. Terrestrial ecosystems removed 2.9 PgC in 2007, down from 3.6 Pg in 2006, largely showing the high year-to-year variability of the sink.

An analysis of the long term trend of the terrestrial sink shows a growing size of the CO2 sink over the last 50 years.


Anthropogenic CO2 emissions have been growing about four times faster since 2000 than during the previous decade, and despite efforts to curb emissions in a number of countries which are signatories of the Kyoto Protocol. Emissions from the combustion of fossil fuel and land use change reached the mark of 10 billion tones of carbon in 2007.

Natural CO2 sinks are growing, but more slowly than atmospheric CO2, which has been growing at 2 ppm per year since 2000. This is 33 per cent  faster than during the previous 20 years. All of these changes characterize a carbon cycle that is generating stronger climate forcing and sooner than expected.

Read more about Emissions rising faster this decade than last (Media release 26 Sep 08).