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IIASA: removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped

Removing fossil fuel subsidies would have only a small effect on CO2 emissions and renewable energy use, according to a new study led by the International Institute for Applied Systems Analysis (IIASA) and published in the journal Nature.

Fossil fuel subsidies amount to hundreds of billions of dollars worldwide, and removing them has been held up as a key answer to climate change mitigation. However, the study found that the growth of CO2 emissions by 2030 would only be 1-5% lower than if subsidies had been maintained, regardless of whether oil prices are low or high.

This equates to 0.5-2 gigatonnes (Gt/year) of CO2 by 2030, significantly less than the voluntary climate pledges made under the Paris climate agreement, which add up to 4-8 Gt/year and are themselves not enough to limit warming to 2°C.

Impact of subsidy removal on cumulative change in emissions from 2020 to 2030 at the regional level (colored bars). Solid lines represent emission effects of unconditional NDCs (Nationally Determined Contributions) and dashed lines of conditional NDCs. Click to enlarge.

The reason for this small overall effect is two-fold. First, these subsidies generally apply only to oil, gas, and electricity. That means that in some cases the removal of subsidies causes a switch to more emissions-intensive coal. Second, while these subsidies add up to substantial sums of money, the rate per unit of energy is not high enough to have a big effect on global energy demand, which would decrease by only 1-7% after subsidies are removed.

—IIASA researcher Jessica Jewell, lead author

In addition, subsidy removal would not boost renewable energy use significantly, the team found. This is because it is generally cheaper to reduce energy demand than to substitute subsidized fuels with renewables.

Although the global effect on emissions is low, the impact varies between regions. The largest effects of removing subsidies were found in areas that export oil and gas, such as Russia, Latin America, and the Middle East and North Africa. In these regions, the emissions savings caused by subsidy removal would either equal or exceed their climate pledges.

Developing economies which are not major oil and gas exporters would generally experience much smaller effects of removing the subsidies. Some of the models used even suggested a rise in emissions for some regions, such as Africa and India, as a result of switching from unsubsidized oil and gas to coal.

The regional differences highlight one very important aspect of subsidy removal that needs to be taken into consideration, the authors said: the impacts on the poor. Many fossil fuel subsidies were put in place to help those with lower income, and despite the fact that most of the money goes to the rich, the poorer you are, the more of your household budget comes from these subsidies, so their removal would have a much larger impact on daily life.

For example, removing subsidies means that the switch to modern fuels may become out of reach for many poor people, the results show. As a consequence they are stuck using firewood or charcoal, which both emit more greenhouse gases and are damaging to health.

However, the highest numbers of poor people are concentrated in the regions where removal of subsidies will have the weakest effect on CO2 emissions. Removing subsidies in richer oil and gas exporting regions would therefore provide significantly greater emissions savings and have a less detrimental impact on the poor. This is facilitated by today’s low oil prices.

The governments of oil and gas producing countries are already under pressure to reduce spending on subsidies as revenues shrink. This provides a unique political opportunity to remove subsidies in countries where it will have the largest effect on emissions and the smallest impact on the poor.

—Jessica Jewel

Ultimately, these results do show benefits of removing fossil fuel subsidies, especially in certain regions, but care is needed for implementation, the authors said.

We’re not saying don’t get rid of subsidies, we’re saying that we need to be aware that it might have less of an effect than hoped, and it could have a disproportionally large effect on the poor. But well-designed policies can achieve subsidy removal without affecting the poor. A scheme being trialed in India, for example, removed subsidies on cooking gas in general but continues to support the poorest households through rebates.

—Keywan Riahi, study co-author and IIASA Energy Program director

The study received funding from the European Union’s Seventh Programme FP7/2007-2013 Nº 308329 (ADVANCE).


  • Jewell J, McCollum, D Emmerling J, Bertram C, Gernaat DEHJ, Krey V, Paroussos L, Berger L, Fragkiadakis K, Keppo I, Saadi, N, Tavoni M, van Vuuren D, Vinichenko V, Riahi K (2018) “Limited emission reductions from fuel subsidy removal except in energy exporting regions.” Nature doi: 10.1038/nature25467



Reduction of fossil fuels subsidies may not be enough to reduce pollution and GHG to desired levels, but the same subsidies given for improved batteries/FCs, charging/refill stations and BEVs/FCEVs may do it?


If increased efficiency has a greater effect, give the subsidies to efficiency research.


Use the subsidy money for sustainable programs.

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