The graph shows development of specific CO2 emissions, defined as emissions of CO2 per transport unit (passenger-km), by passenger transport mode (road, rail, maritime, air) over the period 1995 to 2009.
Specific CO2 emissions data for all transport modes are modelled data derived from TREMOVE (http://www.tremove.org/model/index.htm) and TRENDS (http://www.forum.europa.eu.int/Public/irc/dsis/pip/library?l=/environment_trends).
Specific CO2 emissions are expressed in grams per passenger-kilometer.
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