But Dr Zheludev has found that a similar effect can be achieved by keeping the temperature stable and using a beam of light to manipulate gallium's metallic nature.

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It turns out, of course, that we are very temperature-stable organisms, so if you raise the temperature of our cells by twenty degrees our cells will die.

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In Israel, Solaris Synergy has developed a concentrated photovoltaic technology for a floating farm, which includes an innovative evaporation cooling technology called Aquasun that keeps the silicon elements at a low and stable temperature.

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At that depth, the pressure of the rock overhead is just enough for liquid CO2 to be stable, if the temperature is low enough.

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More recent temperature variations have been relatively much more stable and moderate.

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"Underground, everything is much more stable, " says Zhao, referring to factors such as temperature, humidity and vibration.

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