'3 in 1, 1 in 3 - Trefoil'

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Within an overall unifying loop, the trefoil has two sides to each of the three petals.
This gives rise to the matrix shown below for the integrated cognitive mapping of data.

When applied to the data, it shows the international pattern of carbon efficiency &
inefficiency using PPP or 'Purchasing Power Parity' adjusted dollars
where on global average

the overall pattern is very clear
: -

Full international carbon-efficiency (for 1990)