In most countries, oil is the main fuel source used for transportation. However, this use has lead to a dependence on imported and expensive oil for many countries around the globe, and with oil supplies in decline the move to more renewable and sustainable resources is essential. Oil prices have been fluctuating for decades, and in recent years have risen steeply with prices expected to continue fluctuating, especially due to the fact that the vast quantity of reserves are in politically volatile areas, such as Iran and Iraq. These future increases will particularly adversely impact low income households ‘for who transport accounts for a higher proportional share of household income.’ [1]. Oil discovery has also decreased, with more oil currently being produced than discovered. Recent oil field discoveries such as in the Gulf of Mexico are only a fraction of the volume of previously found locations in the middle east.

Peak oil, a theory widely popularised by US geologist M.K. Hubbert, is ‘…the point in time when oil production reaches its maximum annual rate, after which the annual production rate declines each year.’ [2]. Many geology and supply experts predict that the worldwide peak in oil has either occurred, or will happen in the next few years. Since oil is a finite resource, a move to renewable or sustainable fuel sources is essential, especially ones with a lower carbon content than oil. However, over time society has become so dependant on oil that many alternatives are in their early stages, and need more research and funding to make them competitive with petroleum products.

One major issue that needs to be addressed in the move from oil to more sustainable fuels is consumer preferences. Information detailing the available and soon to be available alternatives is essential, as a lack of information can lead to market failures, which ‘can be caused by insufficient and incorrect information’ [3]. Confusion and doubt over the reliability and costs of new fuels and technologies can lead to public distrust and unwillingness to convert to them, while many consumers are also unaware that options for more fuel efficient cars exist, or even that different vehicles emit different levels of pollutants. Both education and information are essential to help facilitate a move to new technologies and fuels. Try Energy Saving Warehouse’s Lesto Survey to learn about new technologies

Maturity and reliability of fuel sources and technologies is another issue to be addressed. For instance, hydrogen is the most abundant element in the the universe and can be separated for use in fuel cells from other elements by one of three processes: thermal, electrolytic or photolytic [4]. While photolytic processes are still under development, both thermal and electrolytic processes are available commercially. However, costs are still high, and often fossil fuels are required as the input energy for the separation process. There are also some major barriers to the use of hydrogen fuel cells, such as the storage of hydrogen, transport infrastructure, refuelling facilities and cost [5]. While hydrogen fuel cells will likely be a part of the transport sector in the future, there needs to be currently available bridging technologies or fuels to help facilitate the current move from oil.

Infrastructure must also be considered when looking at alternative fuels or technologies: will current engines need to be modified? Are there appropriate transportation and fuel storage facilities? How will recharging stations work? The market for electric cars is steadily growing, however ‘EV charging both in the home and in the public realm is an area that requires careful consideration with regards to regulation’ [6]. Governments and private investors must be willing to invest in the high capital costs that this change in infrastructure will bring about.

Other major issues include the cost of the technologies or fuels, which would be expected to become competitive with oil, or even cheaper, as oil stocks decline and the price rises. Regulatory issues also need to be examined, specifically governments roles in supporting alternative fuels or technologies, such as through subsidies, tax breaks or a range of other policy options, such as to: ‘Implement mandatory fuel economy standards and/or low and zero emission vehicle requirements’ and to ‘Ensure building codes for new or renovated sites (residential, commercial, industrial) to support EVs by requiring dedicated electrical capacity and parking spaces’ [7].

Finally, one highly divisive point in the debate over biofuels is the use of food crops for transport fuel, especially in developing countries where food shortages are already a very serious problem. While using crops instead of fossil fuels reduces emissions during the driving phase, a careful balance needs to be maintained to ensure that crops grown as biofuels are not diverted from those who need it most. Resource availability can vary widely from location to location, with some geographic regions ideally suited to growing large volumes of crops, while other regions may be unable to sustain the growth needed to produce sufficient quantities of fuel. A large amount of water is required to grow biological feedstock, with present volumes seen as unsustainable to increase production of crops. It has been estimated that growing corn as a biofuel results in the equivalent input of 283 gallons of water per mile driven in a car, compared to 0.17 gallons for grain, and only 0.04 for petroleum [8]. Hot and dry regions such as Africa, Southeast Asia and Australia simply do not have the water resources to produce the required volumes of crops to become a viable alternative to oil, though future scientific advances in irrigation and farming practices may help to reduce water requirements.

While there are a range of issues that must be addressed when considering a move from oil, the move is necessary for the long term sustainability of the transport sector, and to reduce carbon emissions and fossil fuel use on a global level. Many transport alternatives such as biofuels and hydrogen fuel cells have great potential, but require more time, money and research to be competitive with oil

References

[1] + [2] CSIRO. 2008. Fuel for Thought- The future of transport fuels: challenges and opportunities. http://www.csiro.au/files/files/plm4.pdf

[3] Dunstan, C., Usher, J., Ross, K., Christie, L., Paevere, P. (2011). Supporting Electric Vehicle Adoption in Australia: Barriers and Policy Solutions (An Electric Driveway Project Report). Prepared for Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO), by the Institute for Sustainable Futures, UTS: Sydney. Page 3.

[4] + [5] U.S. Department of Energy. 2005. Hydrogen and Our Energy Future.http://www.hydrogen.energy.gov

[6] + [7] Dunstan, C., Usher, J., Ross, K., Christie, L., Paevere, P. (2011). Supporting Electric Vehicle Adoption in Australia: Barriers and Policy Solutions (An Electric Driveway Project Report). Prepared for Australian Commonwealth Scientific and Industrial Research Organisation (CSIRO), by the Institute for Sustainable Futures, UTS: Sydney. Pages 20 + 56.

[8] Biofuel.org.uk. Disadvantages of Biofuels – Water. 2010. http://biofuel.org.uk/water.html

Introduction

Over the past decade concern has grown over the environmental consequences of fossil fuels, this has influenced the recent interest in biofuels (Hill et al. 2006).  Ambitious  policies that promote biofuel use and production have not only been set by the EU, but by the USA and China as well (Soimakallio and Koponen, 2011). Biofuels are produced from processed food crops, other plants or animal products and agricultural or organic wastes. Crops grown specifically for energy uses rather than food or feedstock’s, are known as second generation biofuels, these are in development and not currently available for commercial use (Rowe et al. 2009). First generations biofuels are produced from processed food or feed crops, these are used today. Have brought conflict over growing crops for food, growing crops for fuel and protecting the environment.

What advantages are there to using biofuels?

Europe has few crude oil reserves and is highly reliant on imports to obtain fuel, 98% of transport in the EU is entirely dependent on fossil fuels (IPCC, 2011). Rising oil prices improve the cost competitiveness of biofuels helping them enter the market, providing a viable alternative for oil (Hill et al. 2006). European leaders see domestic biofuels as a more secure and sustainable option, providing incentives for more biofuel usage.

The aim of biofuel usage is to help combat climate change by reducing the greenhouse gas emissions that are currently released with the burning of fossil fuels by increasing its share of renewable energy (Banse et al. 2011). The majority of biofuels reduce greenhouse gas emissions by more than 30% when compared to fossil fuels combustion (Scharlemann and Laurence, 2008). When biofuels are blended with petroleum fuel or diesel they can improve air quality, especially in urban regions, as they generally bring a reduction in sulphur, particulates and carbon monoxide (Worldwatch Institute, 2006).

Liquid biofuels are important as they can be substituted immediately into the majority of transport vehicles. Meaning greenhouse gas savings can be achieved with little monetary investment or time developing new transportation infrastructure, making them a popular choice for governments.

Biofuels have the potential to provide environmental benefits, if they are planted on barren land where the soil has low carbon content, they can sequester carbon into the soil, effectively becoming a carbon sink. Moreover, if planted on this type of land they could increase biodiversity and protect watersheds, as they offer a more diverse and natural environment than other agricultural systems (Karta, 2006).

This is great: So what are the disadvantages?

The burning of biofuels can emit less CO₂ than combustion of fossil fuel, the growth and production stage of biofuels needs to be taken into account. Have you considered your personal carbon footprint? Low yielding energy crops, such as corn ethanol, can have heavy inputs of fossil fuel energy during intensive farming and manufacture and can in some cases increase the environmental impact. CO₂ is not the only greenhouse gas emitted during this process, N₂O is also released, affecting the net greenhouse gas balance (UNEP, 2009).

Increase biofuel usage will subsequently lead to the demand for land needed to cultivate biofuel crops (Harvey, 2011). Clearing native ecosystems is sometimes the most profitable method of obtaining land, causing detrimental effects to water, soils and the regional climate (Tilman et al. 2009).  An increase in ecosystem destruction rates will lead to a rise in biodiversity lost.

If biofuel production continues using the same intense methods of farming as have been used over the past century, it will increase the use of chemicals such as nitrogen, phosphorus and pesticides (Hill et al. 2006). These can enter habitats and aquifers, affecting the surrounding ecosystem, causing issues such as eutrophication. Current farming methods use a lot of water in the irrigation and processing of the crops. Biofuels compete with food crops for land space, this competition drives the prices of food up making it difficult to feed the world poor.

Conclusions

Global population has recently exceeded 7 billion (BBC, 2011), and is still increasing. Demand for energy is rising, and sources suggest that we are reaching our level of peak oil, implying that our reliance on fossil fuels cannot continue (IPCC, 2007). I believe biofuels can be used as a short term substitute. However they should not be considered as a long term alternative to fossil fuels, as it is not sustainable. The development of second generation biofuels, if produced sustainably could provide part of an alternative to fossil fuels, as they produce biofuels from waste products and energy grown crops. Yet they should not be completely relied on, as the impacts of growing the amount of biomass needed to replace fossil fuels would be too harmful to the environment.

If you are interested in finding out about the part other alternative energy sources, such as solar power, have to play in the future of energy supply have a look around the website.

References

Banse et al. (2011) Impact of  EU biofuel policies on world agricultural production and land use. Biomass and Bioenergy (35) 2385-2390.

BBC (2011) Population seven billion: UN sets out challeneges, (Online). Avaliable: http://www.bbc.co.uk/news/world-15459643 . [Accessed: 24/11/2011]

Harvey, M. and Pilgrim, S. (2011) The new competition for land: Food, energy and climate change. Food Policy (32) S40-S51.

Hill, Jason, et al. (2006), ‘Environmental, economic and energetic costs and benefits of biodiesel and ethanol biofuels’, Proceedings of the National Academy of Sciences, 103 (30), 11206-10.

IPCC (2011) Special Report on Renewable Energy Soureces and Climaate Change Mitigation: Bioenergy. International Panel on Climate Change. Cambridge University Press: Cambridge, UK.

IPCC (2007) Mitigation of Climate Change. Chapter 4.3.1.3. Petroleum Fuels. IPCC Fourth Assessment Report: Climate Change.

Karta, S. (2006) Environmental effects of Bioenergy. Bioenergy and Agriculture: Promises and Challenages, brief 4 of 12.

Rowe, Rebecca, Street, Nathaniel, and Taylor, Gail (2009), ‘Identifing potential environmental impacts of large-scale deployment of dedicated bioenergy crops in the UK’, Renewable and sustainable Energy Reviews, 13, 271-90.

Scharlemann, J. and Laurence, W. (2008) How green are biofuels? Science, 319, 43-44.

Soimakallio, Sampo and Koponen, Kati (2011), ‘How to ensure greenhouse gas emission reductions by increasing the use of biofuels? – suitability of the European Union sustainability criteria’, Biomass and Bioenergy, 35, 3504-13.

Tilman, David, et al. (2009), ‘Benefical Biofuels – The Food, Energy and Environment Trilemma’, Science, 325, 270-71.

UNEP (2009) Assessing biofuels, United Nations Environmental Programme.

Worldwatch Institute (2006) Biofuels for transportation