In the week of the Asilomar meeting Science published evidence that more pollutants than previously appreciated, including oxides of sulphur, are getting into the lower stratosphere.

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While the aircraft has flown before, this was the first flight for it after being loaded up with eleven different scientific instruments, which will be used to examine trace gases, aerosols, and dynamics of the upper troposphere and lower stratosphere.

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Other techniques aim to enhance marine cloud reflectivity by introducing sea salt aerosols in low clouds, mimic the effects of volcanic eruptions by injecting sulphate aerosols into the lower stratosphere, or place shields or deflectors in space to reduce the amount of incoming solar radiation.

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Yields on ten-year Treasuries, at 3.3%, are lower than they were in August 2008, before bail-outs and recession sent projected deficits into the stratosphere.

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For instance, clouds rising in the troposphere, the lower level of the atmosphere where air mixes freely, will bump up against the boundary of the much more stable stratosphere, forming ripples in the process.

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