The graph shows development of specific PM emissions, defined as emissions of PM per transport unit (passenger-km or tonne-km), by transport mode (road, rail, maritime, inland shipping, air) in 1995 and 2009.
Specific PM 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 PM emissions are expressed in grams per passenger-kilometer (for passenger transport) or tonne-kilometer (for freight transport).
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If you're a meat eater, consider reducing your meat consumption and going for quality rather than quantity. Production of meat consumes enormous amounts of energy, not only for the growth and transport of animal feed, but also for the heating, air conditioning, and lighting of the immense animal farms. Changing to a diet with less meat helps the environment, but is also good for your health. It is best to buy meat from local producers and buy organic too.
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