The fish face trouble when there is not enough water in a stream, Spence said, or if there are changes in the temperature or habitat of the stream.

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Before they can make much progress in confirming that suggestion, climatologists need a stream of reliable data on worldwide temperature trends, both at the surface and in the atmosphere.

ECONOMIST: A heated controversy | The

We can suspect, for example, that the UK might suffer due to shutting down the Gulf Stream, but there would be thousands of other changes caused by the change in temperature, salinity, and acidity levels.

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The new research provides some support for this theory, as well as demonstrating that abrupt temperature changes can have a long-term impact on ocean currents which are, as the Gulf Stream demonstrates, intimately tied to weather systems.

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Rusts especially exercised him: how they lived, under the green live tissue of stems, how they spread, travelling for miles on the jet stream, and how they fell from the sky to infect even the healthiest crop, if the moisture and temperature were right.

ECONOMIST: Norman Borlaug