The above is apparently the term used by the EU.

See examples at

http://ec.europa.eu/environment/pdf/policy/United Kingdom.pd... (p. 2)
"In December 2008, the Committee on Climate Change published a report on the 2050 target and the UK’s first three carbon budgets to 2022. The 80% reduction would require a <B>reduction path</B> of between 34% and 42% by 2020, compared to the 1990 baseline. The report examines the possible pathways for carbon reduction in the UK under differing fossil fuel price scenarios and assesses the expected cost to the UK economy."

http://www.ourclimate.eu/ourclimate/euclimatepolicy.aspx
"Furthermore, projections imply that, based on existing policies alone, this figure should rise to 7.4% by 2012 – just short of the Kyoto target. However, in March 2007, EU leaders agreed that, by 2020, they would cut overall greenhouse gas emissions by 20% compared to 1990 levels. The Commission says this will require a "much steeper <B>reduction path</B>" for industrial emissions, which is the aim of its ETS reform proposal fr the post-2012 period, presented on 23 January 2008."

I've also seen "reduction pathway" but in fewer EU sources.

That being said, I fail to see how the <B>level</B> of 130 g per km could be a <B>path</B> - this is a <B>target</B> as far as I can see. Could you provide more context?

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Note added at 1 hr (2009-11-15 19:38:06 GMT)
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Thank you for responding :-)