interesting question, actually there was a study done on the environmental impact of various methods of delivering media, google says it was called the Digital Europe Project and gives figures....
"The exact results of the study, in terms of abiotic (non-living, fossil or mineral based) material inputs, show that physical retail for one disk is responsible for 1.56 kg of material use. Online shopping (i.e. Amazon.com) resulted in 1.31 kg of material use and online music delivery (i.e. iTunes) resulted in only 0.60 kg of abiotic material use.
The material use in the retail scenario included 0.77 kg for the CD production, 0.43 kg for the retail operation, and 0.28 kg for transport by the consumer.
The material use in the online retail scenario included 0.77 kg for the CD production, 0.14 kg for warehousing and distribution, and 0.25 kg for use of the computer and internet.
The material use in the download scenario included 0.46 kg for the use of the computer and internet."
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