But the publishers cite another factor in fair-use analysis: the amount of the copyrighted work that is used in the creation of the new one.

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Another analysis, also published in the journal Science, looks at the amount of the isotope beryllium-10 in the lunar soil.

BBC: Apollo samples reveal Moon's origin

The UNEP report follows on from a new analysis by the World Meteorological Organisation that says the amount of greenhouse gases in the atmosphere reached a record high in 2011.

BBC: UN says carbon cuts too slow to curb dangerous warming

And no amount of scholarly analysis will convince Americans otherwise, until they regain confidence in their own economic future.

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