http://www.fordfoundation.org/library/reports-and-studies/roads-and-bridges-the-unseen-labor-behind-our-digital-infrastructure http://www.fordfoundation.org/lib

http://www.fordfoundation.org/library/reports-and-studies/roads-and-bridges-the-unseen-labor-behind-our-digital-infrastructure http://www.fordfoundation.org/library/reports-and-studies/ro... is an excellent summary of the issue.