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jueves, 2 de septiembre de 2010

UK can halve maritime CO2 emissions

Source: Carbon positive

A new study into how Britain might aim for a carbon-neutral transport sector by 2050 estimates CO2 emissions in the shipping industry could be halved by employing a range of available measures for maximum impact.

The study, 'Towards a Zero Carbon Vision for UK Transport' by the Stockholm Environment Institute (SEI), estimates that GHG emissions from UK shipping would increase 217 per cent over the next four decades under a business-as-usual (BAU) scenario. This compares to a 60 per cent BAU increase for aviation, 34 per cent for rail and a 5.2 per cent reduction for motor vehicle emissions.

The report uses published studies on a range of measures for reducing emissions in exploring its maximum impact (MI) scenario. It concludes that it is not expected shipping or aviation could become zero-carbon by that time, but rail and road could. Overall, the net impact could see a 76 per cent reduction in carbon output across the entire UK transport sector.

For maritime, the MI scenario considers cleaner fuels, including fuel-switching to LNG; technological and design innovation; slow steaming & voyage optimisation; other operational measures; supplementary wind and solar energy; and shore-side energy efficiency & alternative energy measures in its assessment of the options. Use of biofuels was not considered due to current IMO policy rejecting them on the basis of cost and sustainability.

It finds the reductions in CO2 emissions that can be expected in those areas considered are:

•30 per cent from new technology and design
•23 per cent from speed and voyage optimisation
•4 per cent from cleaner fuels
•2 per cent from shore side measures
Combining all measures could lead to a 49 per cent reduction in BAU emissions from shipping in 2050, or in volume terms a 29.5 MtCO2e annual reduction by that year.

The study opts for freight tonne kilometres as the basis for measuring UK shipping emissions after exploring the problems of calculating emissions and allocating emissions between countries in a sector largely operating across borders and in international waters. But allocating emissions to the UK on the basis of bunker fuel sales, freight tonne kilometres, ports used or territorial waters travelled all have methodological challenges, it says.

Download link:
Towards a Zero Carbon Vision for UK Transport

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