Folks on the right, however, should be careful about over-interpreting this data.

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In a statement the American Chemistry Council also expressed its concerns, saying that the authors could be "over-interpreting their results and unnecessarily alarm workers".

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Moreover, the polls suggest that Americans are keen to punish Mr Clinton, an attitude that cautions against over-interpreting the split between Congress and public on this score.

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At the risk of over-interpreting the figures, it is still fair to point out that the overall engagement index - the one highlighted at the top of the survey - has fallen sharply since 2010.

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Over the last two decades, supercomputing allowed new skill levels in interpreting seismic data of below-ground structures.

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