3 posts • joined 22 Oct 2007
Other emissions from ships
JeffyPooh is right that bunker fuel is the something like to scrag end of the products of crude ("otherwise a waste product"). But he doesn't know much about ships or shipping. Few old ships are efficient enough to still be used - fuel is a large part of the cost - and any "old smoldering slag heaps" would soon be arrested under port state controls, they wouldn't pass flag or class inspections either.
But he continues to be right about bunkers when he states that the other emissions "ALSO HAVE A SIGNIFICANT GREENHOUSE GAS EFFECT". What he doesn't say is that the SOX emissions actually have a refridgerant effect. A major EU-funded study (CE Delft: Climate Policies for Maritime Transport. Design and assessment of possible EU policies. January 2007) has shown that shipping actually has an overall global cooling effect. Currently other emissions more than balance the global warming effects of the world fleet’s CO2 emissions.
But SOX and NOX (the problem emissions from burning bunkers) can be damaging to health if released near to land. However, regulations to reduce these pollutants in the established risk areas of the Baltic and North Sea came into force in August this year. This is why the global industry has consistently called, through the International Chamber of Shipping, for a holistic approach to the reduction of ships’ air emissions, which should seek to balance the competing pressures in the interest of finding the greenest practical solution across the piece.
SOX and NOX are far from easy to reduce (the car rating is low as the fuel has not got the NOX in it - but to use distallate fuel in ships would mean using the same amount of oil as that consumed by the EEC again (you would have to refine that much more, you can't just change the bunker fuel). That would not be good for the environment - the increased refining would mean a 15% increase in CO2 from refineries - or the shrinking oil reserves.
More from the industry - an important story needs some space!
The good news is that – although shipping carries 90% of the world’s trade and 95% of UK trade – it contributes, as the Stern Report shows, only 1.4% of mankind’s CO2 emissions. To base a challenge to Stern’s findings on one leaked report from a tanker shipping association (as recent articles in the Time and the Independent have done) is risky and could leave the public seriously misinformed. This is but one estimate amongst many “confidential” submissions to the UN international body that regulates the industry – the London based International Maritime Organisation.
Moreover, press reports which mix statistics and assessment of emissions of air pollutants (such as sulphur and nitrogen oxides, which have an essentially local impact) with those of CO2 (which has a global impact) confuse even more and are doubly deceptive because, while we support initiatives to reduce air pollutants such as SOx and NOx, these may have a negative effect on CO2. The proposal to move all ships to distillate fuels, for instance, would increase CO2 emissions at the refinery by about 15%. What’s more, such a policy would dramatically increase the world’s consumption of the declining remaining oil stocks. The volume of diesel able to be refined from a barrel of oil is fixed – use more diesel and you use more barrels of oil. And, given the volume of fuel consumed by shipping (more diesel would need to be produced annually than is currently consumed in the entire EU) this could have the knock-on effect of dumping massive amounts of other oil products – kerosene, jet fuel and petrol – on the market. The price of these fuels could go down, encouraging consumption and hence increasing carbon emissions…
A major EU-funded study* has shown that shipping actually has an overall global cooling effect. Currently other emissions more than balance the global warming effects of the world fleet’s CO2 emissions. This is not a cause for celebration as these other emissions, most notably sulphur and nitrogen oxides, can be damaging to health if released near to land. However, regulations to reduce these pollutants – CO2 cannot accurately be described as a pollutant since it is a clean and naturally occurring major part of the air around us – in the established risk areas of the Baltic and North Sea came into force in August this year. This is why the global industry has consistently called, through the International Chamber of Shipping, for a holistic approach to the reduction of ships’ air emissions, which should seek to balance the competing pressures in the interest of finding the greenest practical solution across the piece.
What else are shipowners doing? Newer ships with optimal hull designs and the latest propeller technologies lower carbon emissions significantly. New paints that keep the hulls free from drag caused by barnacles and other sea life offer efficiencies in the order of 10%. The latest application of weather prediction technologies allows a ship’s Master to take better account of adverse weather – a straight line through a storm is not always the most carbon-efficient route!
Better ship-handling techniques, waste heat recovery and reductions in onboard power usage can also all make a difference. Other developments, such as powering ships from shore-based power when they are in port, can also play a role – so long as that shore-based power source is more carbon-friendly than the ships’ own engines!
There is certainly no prospect in sight of any other form of transport coming anywhere near as low in carbon emissions as shipping. The growth of shipping as an alternative to any other mode of transport will continue to offer significant savings in greenhouse gas emissions – such growth offers a potent answer to the global warming effects of the transport of goods. But are absolute emissions a suitable measure for individual sectors? And what does “absolute” mean?
The industry accepts that the level of mankind’s total emissions is the key. It is reflected in the simple overall targets set by the EU of a 20% reduction by 2020, and by the UK’s Climate Change Bill of up to 32% by the same date and 60% by 2050. But many constructive environmentalist groups acknowledge equally that it is perfectly legitimate that, within an overall emissions envelope, emissions reductions in some sectors may be smaller or even go up if that can produce greater savings in output from less carbon efficient alternatives.
The industry has a further concern – the presumption that new technologies will come on stream to meet the demands of legislation as the cost of non-compliance outweighs the costs of investment in research and development. History shows that such assumptions don’t work particularly well in shipping. Take the issue of Ballast Water, where a convention that enters into force in 2009 will be simply unenforceable because the technology that was assumed to be imminent has not yet come on line.
Drivers that may hold true for land-based industries are not present in our industry for two main reasons; first, government-sponsored research into improving shipping efficiencies is virtually non-existent – and this is an area where government intervention would be beneficial. Secondly, in the present climate, the relationship between ship-owners and ship-builders is weighted in the latter’s favour. Owners specifying specific environmental benefits for their ships often face a heavy financial penalty – if they can get their ships built at all. For these reasons we are investigating the merits of calling upon the IMO to require the inclusion of a ship’s carbon performance in the development of new goal-based standards and for all future IMO legislation to include an analysis of its likely carbon impact.
Finally, a more holistic approach to the problem of climate change – looking for the best overall ways to reduce mankind’s greenhouse gas emissions, rather than a piecemeal industry-by-industry or activity-by-activity approach, should not stop at a comparison of transport modes. In this new era we need to look at overall priorities and how to achieve them for the least impact.
A good example of this is the food miles debate. We couldn’t sustain the British population without importing food, but, if we could, would that be better in terms of greenhouse gas emissions? If we focus only on the emissions from transporting food from farm to shop it would seem so – but this is not the only factor to consider. In June this year the government announced that it was working on a carbon calculator that manufacturers and retailers could use to label products with their full carbon footprint. This too is a complex issue, but one thing is increasingly clear – many imported products are responsible for lower total carbon dioxide emissions than the same foods produced in the UK. The low carbon footprint of shipping is significant in making this possible, allowing the relative carbon efficiency of some types of farming – for example African farming that uses little mechanised equipment, or just growing crops in season rather than in heated polytunnels – to be the main influence.
Of course we cannot know what further improvements technology will make possible over the years to come. But with the cost of fuel somewhere around one-quarter of operating costs, shipping has a very real commercial incentive to continue to optimise consumption and thus further reduce its carbon emissions.
The industry is prepared to meet its responsibilities in this challenge. In the UK, we are happy to see some form of rational global measurement or performance standard for a ship’s carbon output, perhaps in some post-Kyoto agreement. We are also committed to delivering reductions in relative emissions, to continuous improvement in the design and performance standards of new ships, and to the success of the IMO’s greenhouse gas indexing trials. We believe that, not only is a global solution the most likely to be achievable and enforceable in practice, but it is also the solution most likely to yield the most significant environmental benefits.
For this reason, it will be important for governments, both individually and in their regional groupings, to press the International Maritime Organisation to move faster and further in developing a significant carbon regime in shipping-related activity. Those states who are uncertain of the value of or are resisting progress in this area need to face up to the global challenge and to join in the endeavour to develop an agreed policy which will encourage all involved in shipping to act responsibly and swiftly.
A few words from the industry!
Recent media reports suggesting that shipping’s impact on climate change is greater than that of aviation are absurd and inaccurate. To move a tonne of cargo by air produces up to 100 times as much CO2 as moving it the same distance by sea. Modern ships can emit as little as five grams of CO2 per tonne-kilometre compared to about 50 grams per tonne-kilometre for a heavy truck or 540 grams per tonne-kilometre for a modern aeroplane. No one can seriously dispute that shipping is by far the most efficient way to transport goods in terms of CO2 emissions. The more freight moved by sea rather than other modes the better it will be for the environment
To compare total outputs of CO2 is even more absurd. Shipping carries 90% of world trade and 95% of UK trade – it is a vastly bigger industry than aviation and performs a completely different role – it’s a bit like comparing all lorry emissions to those from motor scooters. The well-established multiplier effect of emissions at high altitude also makes comparisons difficult and controversial.
The UK is at the forefront of developments to reduce the shipping industry’s environmental footprint – UK ships are the some of the cleanest, greenest, most high-tech vessels in the world and shipping companies have always sought to maximise their fuel efficiency.
Shipping has come a long way in improving its carbon performance over the last thirty years – through efficiencies of scale and technological advances. Fuel efficiencies – and therefore CO2 efficiencies – have improved dramatically.
Ships are getting bigger, allowing them to enjoy enormous economies of scale. A modern container ship emits about a quarter of the CO2 that a container ship did in the 1970s – while carrying up to ten times as many containers. The largest container ships now carry some 13,000 containers – the equivalent of 13,000 lorries not on the motorway in front of you.
The nature of the shipping industry means that CO2 reductions can’t be gained by simply reducing the scale of its operations. We could use our cars less often, take fewer flights or change to low wattage light bulbs. But could we do without food, heating or clothing? For the UK, a small country with a high population density and the fifth largest trading economy in the world, the simple truth is that the country doesn’t have the capacity to sustain its population – even at a subsistence level – without external input. Shipping isn’t just vital to our way of life; for the UK it’s vital to life itself.
Shipping demand is a direct function of the demand of world trade. As trade grows – and the trend has been and continues to be solidly upward – so too inevitably will carbon emissions from the carrier of world trade: shipping. The challenge for shipping companies is made even more difficult, because other pressures – many beyond their direct control – are also driving up ship emissions. Unfortunately, most of our other environmental responsibilities can only be met by solutions that have a negative carbon impact. High-energy ballast water treatment systems, double-hulled tankers, non-TBT paints, marine protected areas and offshore windfarms that lengthen voyages – all of these, to name but a few, increase a ship’s carbon footprint. And then there are other government actions – modal shift has the avowed aim of increasing the volume of goods carried by sea (based on a recognition that the industry is the best alternative in terms of CO2 output), which will inevitably increase total carbon emissions from ships; similarly, delays in port development approvals (perhaps on other environmental grounds) can increase CO2 emissions as ships waste fuel while waiting for berths. Our task is to accept the challenge that likely continued growth will throw at us and try to minimise its environmental impact.
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