Author is an Assistant Professor in the School of Resource and Environmental Studies at 蘑菇AV.
蘑菇AV 60,000 merchant ships sail the world鈥檚 oceans, including container ships, oil tankers and dry bulk carriers loaded with everything from grain to coal. Most operate on carbon-rich fuels such as heavy diesel, and their emissions have negative environmental impacts, are and .
Last year, the International Maritime Organization (IMO), a UN agency that is responsible for environmental impacts of ships, adopted ambitious targets to . The IMO plan regulates carbon dioxide emissions from ships and requires shipping companies to halve their GHG emissions, based on 2008 levels by 2050.
Officials from the marine environmental protection committee of the IMO met in London this week to discuss the shipping sector鈥檚 contribution to climate change. Establishing resolutions to reaffirm existing commitments and frames of reference for a fourth IMO GHG study was high on the agenda.
But that will require .
Demand for shipping expected to increase
Shipping accounts for about , producing roughly the same amount as Germany or Brazil do annually. Shipping emissions are not covered under the Paris climate agreement because they cannot be credited to any one nation.
Maritime shipping is far more efficient than shipping by truck, rail or air, and is responsible for moving more than . Demand for shipping is growing rapidly and could produce as much as 17 per cent of global emissions by 2050, if not mitigated. In order to meet the goals of the Paris agreement, shipping emissions need to be regulated.
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In addition to its long-term strategy to , the ambitious IMO strategy includes , although the details haven鈥檛 yet been decided. Short-term measures could be finalized and agreed to between 2018 and 2023; mid-term measures, between 2023 and 2030; and long-term measures to half GHG emissions, beyond 2030. The IMO鈥檚 ultimate goal is to completely decarbonize marine shipping.
Slow-steaming not the way ahead
The shipping industry is already struggling to adapt to the IMO goals. . The rapidly approaching deadline for implementing short-term emissions reduction measures has led shipping companies to change the way ships are operated, such as by .
Slow-steaming is the most effective way to reduce greenhouse gas emissions from ships in the short-term, but it is hardly an . Slow-steaming significantly reduces fuel consumption, but the longer voyage times lead to higher operating costs, insurance and employment expenses that come with operating a greater number of ships at any given time.
because it is inconsistent with IMO鈥檚 ultimate emissions goals to completely decarbonize marine shipping
Challenges with alternative fuels
Currently, most of the global shipping fleet, about 60,000 vessels, relies on diesel 鈥� only 600 ships use alternative fuels. The sector clearly needs to accelerate adoption of low-carbon fuels.
Alternative low-carbon fuels include , biofuels, , , and hydrogen fuel cell systems with zero emissions. A is currently under development.
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Unlike conventional fuels such as heavy fuel oil and diesel used in maritime shipping, . It also produces less sulphur oxides, particulate matter and nitrogen oxide, which reduces air pollution and the threat to human health.
. However, switching to LNG combustion does not come without risks. The extraction, processing and transport of natural gas produces leaks and greenhouse gas emissions, and .
Switching the rest of the global fleet to other low-carbon fuel alternatives will be , such as taxes or levies on heavy fuel oil and diesel. However, there is still a long way to go to meet 2050 targets.
Emerging economies are also playing a role in reducing emissions in the maritime shipping industry. to allow ships to turn off their engines and use local electricity to power refrigeration, lights and other equipment when docked. This is particularly effective at reducing greenhouse gas emissions when powered by renewables. The country has also launched local incentive programs to encourage the shipping industry to increase its use of renewables.
Full steam ahead
There is no one single silver bullet to help . Achieving IMO GHG emission reductions targets will require all stakeholders, including ship owners, ship builders, governments, industry and to help the maritime shipping industry transition into widespread use of multiple renewable-fuel technologies.
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As the maritime shipping industry faces increasing challenges to reduce environmental impacts such as , and , these IMO GHG emissions reduction targets will be one more regulatory hurdle to wrestle with.
Although 2050 is still 30 years away, the average operational life of a ship is roughly the same, so we still have a long way to go. We need to phase out existing fleets which would fail to meet 2050 IMOs standards and replace with new ships powered by low-carbon fuels as quickly as possible.
It may not be smooth sailing, but the maritime shipping sector needs to stay on course by accelerating adoption of low-carbon fuels.
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