The average carbon-dioxide emissions for global ocean container transport have declined year on year, and by more than 7 percent between 2011 and 2012, according to BSR’s Clean Cargo Working Group’s2013 “Collaborative Progress” report. The data from this report are from more than 2,300 ships, representing more than 60 percent of global ocean container capacity.

The report states that average carbon-dioxide emissions for global ocean container transport have declined year on year, and by more than 7 percent between 2011 and 2012.

It adds that 19 of 25 trade lanes showed CO2 emissions improvements in 2012 and that 58 metric tons of CO2 have been offset by Clean Cargo carriers since 2008.

While changes in carrier representation or global trade conditions may account for part of the emissions reductions described in the report, the continued performance improvement is also attributed to carrier fleet efficiency and year-on-year improvements in data quality.

The report, which includes data from 16 of the world’s leading ocean container carriers, also highlights how the group has improved the measurement, evaluation, and reporting of environmental performance data for global shipping customers and ocean transport providers.