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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Avoid disposing any waste on the streets, in nature, and especially not in the gutter. This rubbish can end up in the water treatment system and overcharge the decontamination process. Take advantage of city waste baskets. They are everywhere and that's what they are for.
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