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last updated : 15/05/2008
Global
Warming Potential - GWP
Source :
CITEPA / CORALIE SECTEN format - last updated 28 February 2008
This index provides an aggregated
figure covering greenhouse gases. Usually, gases included are limited
to the six direct greenhouse gases covered by the Kyoto Protocol
: CO2,
CH4,
N2O,
HFCs, PFCs and SF6.
It is expressed as "CO2 equivalent" because of the GWP (Global Warming Potential) of other substances expressed
in relation to CO2
(the value for CO2
is 1 by definition). Confusion may occur between GWP and real CO2
figures when such data is used by non-specialists.
The index is
calculated on the basis of a time period of 100 years and takes
into account the atmospheric life time of the substances.
Individual gas GWP values defined by IPCC are those of 1995 in accordance
with the decisions taken by the Conference of the Parties :
- CO2 = 1
- CH4 = 21
- N2O = 310
- HFCs = in the range of 140 - 11
700 depending on molecules (weighted values are 5 341 in 1990, 5 835 in 1994
and 1 608 in 2006)
- PFCs = in the range of 6 500 -
9 200 depending on molecules (weighted values are 7 317 in 1990, 7 508 in 1994
and 6 981 in 2006)
- SF6
= 23 900
As illustrated in the next figure, the individual contribution of each gas to GWP varies considerably, with carbon dioxide being the dominant GHG (GreenHouse Gases), accounting for approximately two thirds of the total

Survey
period : since 1990
| Emissions (LULUCF* included) |
Variations |
| Emissions in 2006 : 459 Mt CO2e |
Variation 2006 / 1990 : -11 % |
| Maximum observed : 544 Mt CO2e in 1991 |
Variation 2006 / maximum : -16 % |
| Minimum observed : 459 Mt CO2e in 2006 |
Variation 2006 / minimum : 0 % |
| Main
emitters in 2006 (top 5 of total emissions LULUCF* excluded) : |
| |
1 - Passenger cars 13 %
2 - Residential 12 %
3 - Crops 8.9 %
4 - Livestock 8.9 %
5 - Heavy duty vehicles 6.7 % |
Comments
GWP (Global Warming Potential) for mainland France was estimated at 459 Mt CO2 equivalent (CO2e) in 2006 LULUCF* included, and 532 Mt CO2e, LULUCF* excluded.
Mainly four sectors participated to greenhouse gas emissions, as followed in importance order (LULUCF* excluded) :
- road transport with 24% essentially due to CO2,
- manufacturing industry and residential/tertiary with 23%, due to all of the 6 direct greenhouse gases,
- agriculture/forestry with 19% of total emissions, due to two pollutants : N2O and CH4,
- residential/tertiary with 19% of total emissions, due to all of the 6 direct greenhouse gases.
Energy conversion constituted to a less emitting source with 13% of total emissions in mainland France in 2006 LULUCF* excluded. The sector “other transports “ (all except road) represented less than 2% of total emissions.
GWP emissions have decreased by around 4.5% between 1990 and 2006 (LULUCF* excluded), respectively 557 Mt CO2e and 532 Mt CO2e.
CO2 emissions contributed to 70% of GWP emissions. Then came N2O emissions with 14%, CH4 12% and HFCs/PFCs/SF6 4%).
The biggest increase evolution since 1990 (in GWP) came from HFC emissions : +259%.
Note
The total in this format is different compared to the UNFCCC format (DOM and COM included) and to the KYOTO format (DOM included) due to the geographical perimeter (mainland France only).
* LULUCF : Land Use, Land Use Change and Forestry

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