Twiddling green-thumbs: container shipping’s pending efficiency homework

Nicholas Gallie
Solution Architect and Co-Owner at ConexBird
October 30, 2019
3 min read

Globally, shipping is responsible for 2-3% of all greenhouse gas emissions (GHGs) emitted by human activity [1] -  close to 1 billion tons of CO2 per year. This titanic, outsized influence is mainly due to a lack of regulation or other incentive for shipping lines to improve their energy efficiency and upgrade their fuel source from the heavy fuel oil typically used today. This cheap, dirty “bunker fuel” not only produces relatively more CO2 per unit of energy than gasoline or even diesel [2]: it also contains high amounts of toxic compounds such as sulphur oxides and nitrogen oxides; one large container vessel can generate the annual sulphur dioxide emissions of 19-180 million cars [3].

The IMO is pushing forward strongly

The objections raised by the industry to calls for reform have mostly focused on the financial implications of “cleaner” sources of energy, and the inherent problem of retrofitting existing vessels to make use of them. Nevertheless, effective 2020, the International Maritime Organization (IMO) has imposed a 0.5% cap on sulphur oxide concentrations [4], in an effort to kickstart much-needed environmental reformation within shipping. The IMO’s decision has sent a shockwave across a rigid industrial zeitgeist that views major disruptions such as this as challenging and unnecessary, and shippers’ immediate concerns for profitability in the fuel cap’s wake, whilst arguably short-sighted and introspective, are nonetheless realistic.

The holy grail of becoming greener and cheaper

Irrespective of fuel quality, though, there are other aspects of modern shipping which possess significant room for improvement. The movement of empty containers, which creates no value for shipping lines, has been a longstanding burden for the industry; the costs associated with repositioning these empty containers is in the region of US$15-20 billion per year [6], and up to one-third of all container journeys are being made empty [7].

What’s left unconsidered?

Whilst the energy cost of moving a full unit is naturally higher, an empty container still weighs 2-4 metric tonnes [8], and still requires transportation by road/rail/sea as well as handling by (still mostly diesel-driven) cranes. Corollary factors, such as path inefficiency and equipment breakdown, only add to the environmental burden of containerized transport. All in all, at least 10% of the container’s total emissions could be prevented merely by ensuring it spends less time in unnecessary transit, using systems and techniques available today.

Empty containers are full of inefficiency

Pro rata, each 40’ container shipped is responsible for roughly 2-4 metric tonnes of CO2 in associated emissions; half of this will come from the first and last road-based portions of its journey, which represent only a small fraction of the total distance travelled.

Many of those who read that last statement will now be wondering “so what?”; indeed, it is difficult to internalize the real-life consequences of this “load of hot air”. Here’s a more grounded comparison: every time you move a 40’ container, say, from Beijing to London, you’ll need at least 150 young trees to grow and “work” for a whole year, just to compensate for the emissions produced [9]. To compensate for the total carbon cost of moving their boxes around the world, container owners would have to collectively plant and nurture a forest the size of Belgium [10].

It’s the small things after all

The merits of covering Belgium in a sea of trees to tackle climate change are debatable, particularly for the people of Belgium. Nonetheless, what is clear beyond doubt is that wasting time benefits no one; we haven’t got much left [11]. Shipping lines have little to lose and plenty to gain from taking a closer look at how their boxes move, why their boxes move, what they could do better than they’re not doing already. From this small change in strategy, in fact, we all have plenty to gain. 

About the Author:

Nicholas Gallie is Solution Architect and Co-Owner at ConexBird, responsible for business development and customized client and partner solutions.



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Twiddling green-thumbs: container shipping’s pending efficiency homework

The container shipping industry gets increasing attention because of its great contribution to climate change. While some actions to fight greenhouse gas emissions are trending in the media, such as the introduction of LNG powered vessels, there is lots of untapped potential hidden in inefficient container operations. This article sheds light onto this very room for improvement.
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Twiddling green-thumbs: container shipping’s pending efficiency homework

The container shipping industry gets increasing attention because of its great contribution to climate change. While some actions to fight greenhouse gas emissions are trending in the media, such as the introduction of LNG powered vessels, there is lots of untapped potential hidden in inefficient container operations. This article sheds light onto this very room for improvement.
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