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Ozoning Out

On climate confusion

By Umbra Fisk
14 Nov 2005
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Got questions about the environment? Ask Umbra.
Got questions about the environment? Ask Umbra.
question Dear Umbra,

Any chance that the most extreme of the peak-oil folks are correct, and that in spite of our thoughtlessness, we just won't have enough oil to totally destroy the ozone layer?

Dan Wasson
Pittsburgh, Penn.

answer Dearest Dan,

Oil has very little to do with the ozone layer, but it does have to do with global warming. Global warming and ozone depletion are, for our daily purposes, two separate issues. They both involve gaseous, human-generated emissions, mysterious atmospheric phenomena, and wishing we had paid attention in chemistry class, but the similarity stops there.

Aerosol spray.
Psst ... remember me?
The ozone layer, up in the stratosphere, blocks UVB rays from entering our atmosphere in large numbers. Ozone depletion is attributed to anthropogenic gases (chlorofluorocarbons, methyl bromide, and others) cleverly known as "ozone depleting substances." These are expelled down here in the atmosphere, then travel up through the troposphere and into the stratosphere, where UV rays bust them up, causing them to release atoms that eat away at the ozone layer. Infamous ODS sources are refrigerants, including those in air conditioners; aerosols; solvents; methyl bromide, which is a soil fumigant; and foam-blowing agents. If you wish to understand all you can about ozone depletion, please visit the lovely EPA site on the topic.

Oil and the burning of oil, on the other hand, are associated with global climate change, as the burning of oil releases "greenhouse gases." What I think you're asking is whether we will run out of oil before we completely mangle our climate. If the most extreme of the peak-oil folks are correct, and we have reached or passed the point at which world oil production will start a steady decline, it may be that oil will not deal the final maiming blows. Not to worry. Coal is ready to step right up and grab the bludgeon. We have plenty of coal.

But according to some climate analysts, we have already gone past the point of no return. We're hosed! Don't worry, have a home brew with Dick, Gale, and George! They're not worried! Wouldn't they tell us if they were worried?

Sarcastically,
Umbra



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Yours is to wonder why, hers is to answer (or try). Please send Umbra any nagging question pertaining to the environment -- but first check out her FAQs!
The claims made in this column may not reflect the views of this magazine. Neither the magazine nor the author guarantees that any advice contained in this column is wise or safe. Please use this column at your own risk.
Umbra Fisk is Grist Research Associate II, Hardcover and Periodicals Unit, floors 2B-4B.
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causes, effects

While it is true that the depletion of the ozone layer occurs by a mechanism that is completely different from that which causes the greenhouse effect, it is easy to conflate the two. To wit:

  • Ozone is itself a "greenhouse gas" and contributes to the greenhouse effect.

  • The mechanism by which ozone is depleted relies not only on "ozone depleting chemicals" but also on temperature and light: it occurs in the southern hemisphere in the early spring, when it's very cold but the sun has just come out. So, a change in temperature may provoke a change in the ozone layer.

It's all connected, man; it's all connected.

one vice for another

The trouble with peak oil is that it will be replaced by dirty coal. Not only will we still have billions of tons of CO2 spewing into the atmosphere, but we'll have thousands of additional tons of mercury, uranium, arsenic, sooty ash, and many other heavy metals and carcinogens.

Dirty, Coal-Fired Power Plants in Illinois


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