Because the intensities of the 397 ka BP and present insolation minima are very similar, we conclude that under natural boundary conditions the present insolation minimum holds the potential to terminate the Holocene interglacial.

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"Feathers are one of the things that transit the imaginary boundary we put between the human and natural world, " he explained.

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While a single wind-turbine does not affect the global atmosphere, the installation of a large number of such devices will interfere with the atmospheric circulation and diminish the extraction efficiency on the large scale, since any extraction of momentum will act in competition with natural wind-power energy dissipation by turbulence in the boundary layer.

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The scope for this lay in the fact that they had to decide where the boundary mark should be between exam grades each year, there being a natural tendency towards generosity.

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