It’ll vary from shoe to shoe depending on what materials they use and whether Nike offsets by buying carbon credits. There’s a useful link where somebody looked at the impact of an older pair, the Air Max 180, and found that the carbon footprint was roughly 5 kg of carbon. You can find the link here: http://www.sourcemap.org/beta/stage/index.php/objects/object-740
Nike also hopes to be carbon neutral by 2011, which would mean that there would be no impact from each shoe. The article can be found here: http://www.environmentalleader.com/2007/05/31/nike-plans-to-be-carbon-neutral-by-2011/
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