Scientists consider high-altitude aerosol spraying to ‘fight global warming’


Scientists weigh geoengineering in global warming battle

High-altitude aerosols, different from the ones found in spray cans, can play a big role in climate.

USA TODAY | Apr 19, 2009

By Dan Vergano

Not every crazy idea, say dropping out of Harvard to start a software firm, is a bad one. But you don’t have to be Bill Gates to place your bets that way.

Consider atmospheric geoengineering — pumping reflective particles into the stratosphere to reflect sunlight — seen as a way to cut the effects of global warming. In 1991, the eruption of Mt. Pinatubo in the Philippines cooled the atmosphere’s average temperature worldwide almost one degree Fahrenheit, a kind of “global dimming,” serving as an inspiration for the idea. Such high-altitude aerosols, different from the ones found in spray cans, can play a big role in climate.

A 2006 paper in the journal Science, for example, written by the eminent atmospheric scientist Tom Wigley of the National Center for Atmospheric Research, suggested that annually blasting roughly 500,000 tons of sulfur (about 7% of yearly sulfur production) into the stratosphere every year for three decades would prevent global warming. But there is that acid rain issue.

Earlier this month, White House science adviser John Holdren found himself at the center of a brouhaha over remarks to the Associated Press that geoengineering of all sorts was “mentioned” as the administration pondered means of limiting global warming. Holdren later downplayed geoengineering schemes, after news stories appeared linking atmospheric geoengineering to drought, ozone depletion and acid rain, among other concerns.

A pair of recent papers point to some unintended consequences of atmospheric geoengineering, ones that add to the sense that it might not be such a good idea.

In a study in the journal Environmental Science and Technology, federal scientist Daniel Murphy of the National Oceanic and Atmospheric Administration looked at what stratospheric aerosols would do for solar cells and mirrored solar power collectors. He turned to 1991 data from the Mt. Pinatubo eruption for an answer.

In the study, calculations of sunlight scattering combined with records from Hawaii’s Mauna Loa observatory showed that for every one watt’s worth of sunlight reflected away from Earth by stratospheric aerosols, another four watts were converted from direct sunlight to diffuse sunlight. Such sunlight is bad news for the large power-generating solar collectors that rely on mirrors to concentrate power. Even though total direct sunlight fell only 3% in 1991, power generated by these collectors dropped by 20%. “It turns out that any systems using mirrors to concentrate direct sunlight are much more sensitive than one-for-one,” Murphy says, by e-mail.

“Among all of the possible side effects of geoengineering, the effect on solar power is probably not the most important. It is one of the most certain,” Murphy adds.

A second paper, out Sunday in the journal Nature Geoscience, points to another problem with stratospheric aerosols. “We are really uncertain about their role in the climate system,” says study lead author Dan Cziczo of Pacific Northwest National Laboratories in Richland, Wash. Ice condenses around aerosol particles, a process that scientists know leads to high-flying cirrus clouds. Those clouds in turn reflect sunlight, a cooling effect in the global warming equation.

But how this happens exactly isn’t clear, Cziczo says. “So, what we were really trying to do was look at what particles helped to form the clouds,” he says. “What really cropped up was lead.”

In a series of field measurements of ice crystals combined with cloud chamber experiments, Cziczo and colleagues found that lead makes a great ice condenser in stratospheric aerosols, a first report of this effect.

“Most of the lead in the atmosphere is not natural,” Cziczo notes, but was spewed out in leaded gasoline in previous decades and is still used in light aircraft engines. Lead is one of the worst pollutants of the industrial age, linked to lowered intelligence scores, nerve damage and high blood pressure, among many other ills.

But plugging lead into a series of climate models, the Nature Geoscience study shows that high stratospheric lead levels would lead to ice clouds whose sunlight reflection would cut current global warming in half. “These are the kinds of emissions we might have seen in the late 1970’s,” Cziczo says. In past decades, lead pollution may have helped keep global warming at bay.

“The study helps to highlight why talk of geoengineering is something we shouldn’t pursue now,” he adds. “It’s a bit arrogant to presume we understand aerosols so well we could not expect unintended consequences.”

10 responses to “Scientists consider high-altitude aerosol spraying to ‘fight global warming’

  1. There is no frickin global warming!!! What a bunch of BS!

    Now they WANT lead in the air? The same stuff that causes LEAD POISONING when ingested?

    We thought ACID rain was bad! What about LEAD RAIN!?!?!?

    The earth is going to heat up and cool down in cycles. It’s a fact. It’s natural and normal.

  2. The Club of Rome elite know their little global warming hoax is just that, a hoax, but they need a pretext to continue spraying us from the air with whatever the latest poison is, and continue developing newer and more effective aerosols to use on us. And the people will go along with it because it’s all for our safety because the elite love us so much….*cough*

  3. Hi,

    we have just finished an artwork using a chemtrail. There is an English and Spanish version available for distribution. Please spread the word, as artwork can enter society and change a lot of passivity into cultural activism.

    or google for TBW Blue Wars.

    Kind regards and CHEMTRAILS NO.

  4. they are already doing this, look up, those arent contrails, contrails disappear, these make clouds.

  5. Pingback: O vapor barato das chemtrails « Internetcidade: cidades e pessoas ligadas, em rede, com o mundo

  6. Aren’t we all living in ignorance ! The writing on the wall is in plain view to everyone, if we care to see it of course. It is called population control. Too many people on this planet, for their liking. Just take a look at the Georgia guide Stones, Doesn’t come any simpler than that.
    Take good care everyone, be prepared xx

  7. Su,

    You know the score…one of the few

  8. Nice to know I’m not on my own pj, thanks.

  9. Su

    You are not the only one…just that you may be one of a tiny handful in your area. I met a non-pod-person today for example, but it was the first in a long time. I summarized the NWO for him and he said he basically knew it pretty much already, just not in detail as I laid it out. So have faith!

  10. Pingback: O vapor barato das chemtrails | Internetcidade

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