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This is Scientific American 60-second Science. I'm Julia Rosen.

When lightning sparks across the sky, it sends out low-frequency radio waves that researchers can use to determine its location.

Recently, scientists were looking over a map of lightning activity when they noticed something strange.

Narrow lines of increased lightning frequency stretching across the Indian Ocean and the South China Sea.

Straight features like these are rare on a spherical spinning planet, except where humans are up

to something, in this case sending ships across the sea.

So I had pretty immediately in my mind

postulated that this was a result of the pollution

from ship exhaust, influencing the way the storms develop.

Joel Thornton, an atmospheric chemist at the University of Washington.

That hypothesis had already been put out generally in the field

more than a decade ago.

But we had been lacking sort of clear evidence that this was happening on a sort of large scale, long time horizon.

The new maps changed that.

Thornton and his team found that, on average, lightning activity almost doubled over shipping lanes compared to adjacent areas of the ocean.

The researchers ruled out natural explanations for

the pattern and concluded it must be related to ship exhaust. Exhaust increases the number of

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