The Rise of F-Gases as Share in Global Warming Emissions

June 2004
Report for Greenpeace International
Winfried Schwarz

Today, the share of F-gases (fluorinated greenhouse gases) in total global warming emissions is already very high, if not only the chlorine-free fluids regulated by the Kioto Protocol are considered. Including present-day emissions of chlorine-containing F-gases, the current global warming potential of F-gas emissions represents not 1.5%, but 4.1% (rated with GWP 100yr) or 5.2% (rated with GWP 20yr) on a world-wide average. 

By 2050, today's world-wide emissions of CFCs/HCFCs are expected to be completely overtaken by HFC emissions. Then the role of chlorine-free F-gas emissions in global greenhouse gas emissions will be still more prominent with shares of from 4.5 to 6.6% (rated with GWP 100yr) or 6% to 9% (rated with GWP 20yr). Their global warming potential will outnumber that of nitrous oxide, hitherto being the third largest greenhouse gas.

These forecasts of F-gas emissions are based on annual growth rates being different for industrialised and developing countries as of 2002. In industrialised countries, a slight decrease of absolute F-gas emissions is likely. For developing countries' emissions an annual growth rate of 4% is assumed. These assumptions are not arbitrarily high but are even lower than the extrapolated usage trends of the recent years. According to the scenario which finds most favour with Greenpeace, by 2050 F-gas emissions account for 6.2% (GWP 100yr) or 8.6% (GWP 20yr) of the total direct greenhouse gas emissions.

By 2050, by far the most important source of F-gas emissions (over 65%) will be the refrigeration and air-conditioning sector, and commercial refrigeration will be its most important sub-sector. This is why early replacement of HFC refrigerants with natural refrigerants as well as with technologies more compatible with the climate (from a TEWI perspective) is very significant. 

In June 2004, such an initiative ("Refrigerant Naturally") was presented in Brussels by Coca Cola, Unilever, and McDonald with support from Greenpeace International.


The rise and rise of fluorinated greenhouse gases as a share of global warming emissions

A Study Prepared for Greenpeace International
Author: Dr. Winfried Schwarz (Öko-Recherche) 2004



1. Global warming impact of HFCs, CFCs, and HCFCs

HFCs are chlorine-free substitutes developed by the chemicals industry to replace ozone-depleting CFCs and HCFCs. These are hydrocarbons with fluorine (F) in the molecule. While CFCs/HCFCs contribute both to the destruction of the ozone layer and to global warming, HFCs are only a threat to the climate. Their impact is frequently underestimated, as only their current share in overall greenhouse gas emissions is considered.

2. The global 1.5% share of chlorine-free F-gases in total greenhouse gas emissions

Emissions of chlorine-free F-gases, which is the collective term for HFCs and two other groups of fluorinated greenhouse gases (SF6 and PFCs), accounted for 1.5% of total direct greenhouse gas emissions in 2003. Carbon dioxide is the most important greenhouse gas , but methane and nitrous oxide also have considerable global warming impacts. Under the Kyoto Protocol on Climate Change, these three gases and the chlorine-free F-gases constitute the basket of gases whose emissions have to be reduced in order to mitigate climate change.

3. Globally, up to now HFCs have replaced CFCs/HCFCs by less than 30%

From recent studies within the scope of IPCC and UNEP, it emerges that up to now HFCs have replaced globally CFCs/HCFCs by less than 30%. Although the global warming impact of chlorine-containing F-gases is substantial, it is scarcely noticed or recorded because these gases are viewed almost exclusively from the angle of ozone depletion. Consequently, less than 30% of the actual global warming impact of all F-gases taken together, i. e. chlorine-containing (CFCs/HCFCs) as well as chlorine-free F-gases (most importantly HFCs), is accounted for.

4. Why the Kyoto Protocol disregards chlorine-containing F-gas emissions

Underestimating the climate impact of F-gas emissions has political, or better, practical reasons. F-gases containing chlorine (and bromine) have been deliberately excluded from the Kyoto Protocol as the latter may not interfere with the Montreal Protocol on ozone-depleting substances (CFCs/HCFCs). Such interference would be possible if climate protection measures - which according to the Kyoto Protocol are designed to curb emissions, not necessarily to eliminate them - were to be applied to chlorine-containing F-gases. A global step-by-step phase-out by 2040 has already been agreed on for CFCs/HCFCs.

5. World-wide transition from chlorine-containing to chlorine-free F-gas emissions

Chlorine-containing F-gases will continue to be used until 2040. Furthermore, the global rise of emissions of chlorine-containing F-gases is not expected to stop before 2050. Only then are today's emissions of CFCs/HCFCs expected to be overtaken by HFC emissions. Taken historically, we are currently at an early stage of the world-wide transition from chlorine-containing to chlorine-free F-gas emissions.

6. Every existing CFC/HCFC application will be replaced by HFCs in the future

In the 1990s, a large number of applications of chlorine-containing F-gases were completely or significantly abandoned in favour of climate-friendly fluids or technologies (aerosols, solvents, fire extinguishers, foam blowing agents etc.). Refrigeration and air-conditioning remained the largest and most important sectors where a transition was made to HFCs. Today, almost two-thirds of all CFC, HCFC and HFC emissions arise from refrigerant applications. An additional 10% originate in the manufacture and use of insulating foams, which are themselves mainly used in connection with refrigeration (refrigeration appliances and cabinets, cold storage rooms, refrigerated vehicles etc).

In other words, every application running with CFCs/HCFCs today must be assumed to become an HFC application sooner or later.

7. Recalculation of chlorine-containing F-gases raises F-gas share up to global 4.1%

If today’s total chlorine-containing F-gas emissions were recalculated to represent emissions from chlorine-free F-gases (HFCs) that will likely succeed them, the current global warming potential of F-gas emissions would represent not 1.5%, but 4.1% (rated with GWP 100yr) or 5.2% (rated with GWP 20yr) on a world-wide average.

8. F-gas emissions are expressed by global warming potentials of HFCs

In this recalculation of all present-day F-gas emissions into emissions of chlorine-free F-gases, the CFCs/HCFCs are not rated with their own specific contribution to the greenhouse effect. If the global warming potential of these gases had been taken into account, the resulting global warming F-gas emissions would be much higher. This study calculates on the basis of the HFC type that will most likely be the substitute for each application of CFC or HCFC, based on past experience, e.g. HFC-134a or HFC-blends like R-404A, R-407C, R-410A. Their global warming potential (GWP) serves as the measure of the climate impact of F-gas emissions. The GWP values are expressed relative to CO2 and calculated for a time horizon of 100 years.

9. Industrialised countries are responsible for 80% of all F-gas emissions

Following recent UNEP reports, 80% of emissions of HFCs, CFCs and HCFCs originate from industrialised countries. These include the USA, Europe with Russia, Japan and Australia. Only 20% of total F-gas emissions (chlorine-free plus chlorine-containing recalculated to chlorine-free F-gases) originate in developing countries, home to more than 80% of the world’s population.

10. The F-gas share in industrialised countries is 6.2%, in developing countries it is 2.1%

In industrialised countries alone, the recalculated present-day F-gas emissions make up a share of 6.2% (GWP 100yr) of industrialised countries' overall greenhouse gas emissions, including carbon dioxide, methane, and nitrous oxide. (This represents 1.2 billion tons of CO2 equivalent, expressed with GWP 100yr.) Developing countries’ emissions total 2.1% (0.4 billion tons CO2 equivalent.)

11. Fast growth of F-gas emissions in developing countries until 2050

Up to now, emissions of chlorine-free and chlorine-containing F-gases have simply been added mathematically. As mentioned above, this will last until 2050. But the world of 50years hence will look very different from today. Developing countries will have industrialised to a considerable extent – like in east Asia, south Asia and South America. This will lead to greater output of greenhouse gases, especially CO2. The 2050 share of developing countries’ F-gas emissions depends on the growth rate of F-gas emissions compared to the growth rate of emissions of other greenhouse gases. As the use of F-gases best indicates the degree of industrialisation, F-gas emissions are assumed to grow even faster than CO2 emissions over the next 50 years.

In industrialised countries, in contrast, a slight decrease of greenhouse gas emissions is likely, for F-gases as well as for the other three greenhouse gases. F-gas emissions of industrialised countries can thus be predicted to represent the same 6.2% share in overall global warming emissions by 2050 as in 2003. It should be noted that the 6.2% share by 2003 is a calculated figure whereas the same figure by 2050 will be genuine.

To guard against misunderstanding: the transformation of present-day chlorine-containing F-gas emissions to chlorine-free F-gas emissions is one process, and the general growth in F-gas emissions from 2003 onwards (as assumed for developing countries) is another. Both processes will run simultaneously over the next decades.

12. Developing countries will also reach 6.2% F-gas emission share by 2050

If an annual growth rate of 4% is assumed for developing countries’ F-gas emissions and, based on the IPCC 2001 main scenarios (illustrative ‘marker’ scenarios), an annual growth rate of 2% is assumed for the other greenhouse gases (CO2, methane, and nitrous oxide), F-gas emissions in developing countries will in 2050 reach the same 6.2% share of all greenhouse gas emissions as in industrialised countries.

13. Per capita emissions of developing countries at half the level of industrialised countries

According to this projection, by 2050 in absolute terms the overall greenhouse gas emissions from developing countries will be almost three times higher than those from industrialised countries (respectively, 50 and 17 billion tons CO2 equivalent). The same ratio between developing and industrialised countries applies to F-gas emissions with 3 billion and 1 billion tons of CO2 equivalent, respectively. Even in these circumstances, however, per capita emissions of both all greenhouse gases and F-gases alone in developing countries will still be only slightly greater than half the level of industrialised countries.

14. The 8.6% share of F-gas emissions over the 20-year period

A time horizon of 100 years is most commonly used to calculate the climate impact of F-gas emissions. For analysing short-term climate impacts (glacial retreat, decline in tropical rainfall, etc.) this medium-term time horizon is less suitable than the shorter time horizon of 20 years. The latter indicates that for a short period the climate impact of F-gases is even higher relative to CO2 than for a longer period. If the time horizon of 20 years is applied, the global warming potential of F-gases as well as of methane increases both absolutely and relative to the global warming emissions of carbon dioxide. Over a 20-year period, not only the calculative 2003 share but also the likely actual 2050 share of F-gas emissions rises to 8.6% (compared to 6.2% when rated with GWP 100yr).

It should be stressed that the two time horizons are equivalent from a scientific point of view.

15. The high global warming potential of F-gases makes their substitution important

The very high share of F-gas emissions in total greenhouse gas emissions (6.2% and 8.6%) can be reversed. It will come about only if current use and emission trends continue. If more attention is directed to curbing emissions in the future, by, inter alia, implementation of the industrialised countries' commitment under the Kyoto Protocol, or if climate-damaging F-gases in present-day applications are increasingly replaced by climate-friendly substances and technologies, F-gas measures could achieve considerable success in mitigating climate catastrophe.

16. The key role of refrigerants, especially in commercial refrigeration

Refrigeration and air-conditioning play a key part in the current and future development of F-gas emissions. According to recent investigations in preparation of a special IPCC report on F-gases, roughly 63% of world-wide F-gas emissions arise from leakage and irregular decommissioning of stationary and mobile refrigeration and air-conditioning equipment. Half these emissions are attributable to the largest subsector of refrigerant application: commercial refrigeration. This subsector represents such a large slice of emissions because of the wide use of refrigerant blends like 404A for freezing perishable food. This HFC blend has a particularly high global warming potential: over a 100-year period it is 3,500 times greater than that of CO2. Containment of emissions or F-gas replacement by natural refrigerants is therefore of great importance in commercial refrigeration. The challenge of substituting fluorinated refrigerants grows with the size of the equipment. Replacement should thus start with smaller decentralised refrigeration units, which are usually industrially pre-fabricated. Although such so-called stand-alone equipment contains no more than 10% of refrigerants used world-wide in commercial refrigeration, the signalling of a partial F-gas phase-out should not be underestimated.

17. Refrigeration system types used in worldwide commercial refrigeration

Commercial refrigeration equipment types vary greatly in size, mainly depending on country and kind of shop. According to a recent UNEP report, commercial refrigeration equipment consists of three main system types.

• Centralised systems are installed in super- and hyper-markets. A wide range of refrigerating capacity is estimated to be installed in 340,000 such outlets. Here, the refrigerant charge varies from 100 kilos-2,000 kilos. The refrigeration system is installed in a machinery room and the refrigerant circulates between this and display cases in the sales area.

• Condensing units are typically installed in specialised shops. Their refrigerant charge varies between 1 and 5 kilos, and their estimated global number is around 32.5 million. The refrigerant of choice depends on the temperature range required. Both HFC-134a and HFC blend R-404A are preferred for medium temperatures, and R-404A for low temperatures. Due to safety concerns, HCs are not a common option for the charge amount normally present in condensing units.

• Stand-alone equipment includes integrated display cases, ice machines, vending machines, and an array of small equipment installed in stores or public areas. It is estimated that there are more than 50 million units in this category world-wide. Refrigerant charges range between 0.2 and 1 kilo. HFC-134a is the dominant option at present.

18. A push for climate protection announced by food and beverage companies

Several large food and beverage companies have indicated that they will refrain from using HFCs within a few years where suitable alternatives are available. Coca Cola, Unilever and McDonald’s, for example, own about 12 million beverage and ice cream vending machines between them. Implementing the measures they announce would significantly cut the global amount of fluorinated greenhouse gases in commercial stand-alone equipment, which is highly prone to leakage and, consequently, to global warming emissions.