Environmental Ship Index (ESI) has started evaluating performance in the field
of Carbon bi dioxide (CO2), says a release on 1st July. To
date, only the environmental performance of ships on emissions of air pollution
(NOx and SOx) were assessed. This makes the index the first sustainable quality
mark in international shipping that includes the performance and, more particularly,
the reduction in CO2 in its assessment.
does this based on historical data already included in the index. The ESI
compares the fuel consumption and the nautical miles traveled in the
past three years (e.g. 2013, 2014, 2015) to that of the following year (2016).
If relatively less fuel has been consumed – in other words, if sailing was more
efficient – then less CO2 has been emitted. ESI has chosen for this method
because it is actually very difficult to measure CO2 emissions.
The ESI is a
score that is issued at the request of ship owners as of 1 January 2011. Ships
that score high on the Environmental Ship Index receive a premium from the
participating ports and other organisations that reward sustainable shipping.
As of 1 April 2017, the index comprised 5,497 ships and 50 bonus providers.