Shipping emissions of carbon dioxide (CO2) are underestimated by as much as three times, according to the British daily Guardian, which quotes a new study that shows that annual emissions from the world's merchant fleet have already reached 1.12 billion tons of CO2, or nearly 4.5% of all global CO2 emissions.
The UN's Intergovernmental Panel on Climate Change (IPCC) until now estimated that shipping was causing a maximum of 400m tonnes of CO2, but this new study shows that emissions are three times worse than feared. Moreover, the study warns that CO2 emissions by shipping look set to rise by a further 30% to 1.45bn tonnes within 12 years and that other pollutant emissions such as nitrogen (NOx), particulate matter (PM) and sulphur oxides (SOx), which are responsible for acid rain and respiratory problems, could rise even more than that if no action is taken. This would make shipping responsible for about 6% of global CO2 emissions by 2020.
Many governments have outright failed to include shipping emissions in their national estimates for CO2 emissions.
References:
True scale of CO2 emissions from shipping revealed - the Guardian
Shipping boom fuels rising tide of global CO2 emissions - the Guardian
UN says shipping emissions 'grossly underestimated' - EurActiv
Shipping emissions underestimated by as much as three times, says leaked UN report - Bellona
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Comments: 16
Anyway, this raises the question as to what should be done about shipping emissions. You may have read my article "Iceland - The world's first hydrogen society". In that article, I wrote about Iceland's steps to use its abundant geothermal energy to power cars, buses and boats. I also see a lot of prospect in using excess wind power to produce hydrogen, which could subsequently be used to power ships. Hopefully, this new study will trigger more development in such directions.
Thanks for that, James! My username there is samcarana
http://del.icio.us/samcarana
PS. Did you also read about the German ship with the sail, at:
http://www.reuters.com/article/inDepthNews/idUSL1548100520071217
http://news.bbc.co.uk/1/hi/world/europe/7201887.stm
Good article, thanks.
Your point about unreported and under-reported emissions is a good one. Elsewhere as part of one of the discussions, I mentioned an chemist at a Swiss university who works on green explosives and gunpowder. One of his motivations is the massive amount of pollution caused by space-shuttle launches and similar events- a very legitimate concern.
Also, many years ago, I was involved in discovering an unrecognized source of an ozone-destroying gas. I didn't co-author the paper because I was afraid of losing my job (a valid fear in theory, though maybe I over-reacted). The point is that a major industrial process released N2O and nobody in atmospheric chemistry knew about it, so they couldn't explain or understand why the levels of N2O were so high in the various atmospheric levels. At the time, EPA didn't require reporting of these releases of N2O to the atmosphere, so there were no Federal records. This kind of thing could still happen.