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Author Topic: Ozone hole trend  (Read 1330 times)

Bugalugs

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Ozone hole trend
« on: July 10, 2019, 01:27:35 AM »
I am having difficulty assessing the overall trend in ozone hole size. On the one hand the hole was predicted to get smaller, on the other hand it was record large in 2015.

Online graphics that I have was hoping to compare with recent figures tend to cut off around 2014.

Is there a good page out there assessing the trend? Or a recent animated graphic incorporating the past 30 years or so up to now?

kassy

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Þetta minnismerki er til vitnis um að við vitum hvað er að gerast og hvað þarf að gera. Aðeins þú veist hvort við gerðum eitthvað.

gerontocrat

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Re: Ozone hole trend
« Reply #2 on: July 10, 2019, 06:03:14 PM »
I am having difficulty assessing the overall trend in ozone hole size. On the one hand the hole was predicted to get smaller, on the other hand it was record large in 2015.

Online graphics that I have was hoping to compare with recent figures tend to cut off around 2014.

Is there a good page out there assessing the trend? Or a recent animated graphic incorporating the past 30 years or so up to now?
https://ozonewatch.gsfc.nasa.gov/ has it all?
"Para a Causa do Povo a Luta Continua!"
"And that's all I'm going to say about that". Forrest Gump
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Bugalugs

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Re: Ozone hole trend
« Reply #3 on: July 11, 2019, 08:20:57 AM »
Crikey, don't know how I missed that, I'll buy a white cane.

Tom_Mazanec

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Re: Ozone hole trend
« Reply #4 on: September 24, 2019, 09:29:54 PM »
In the 1980s, the World Acted to Save the Ozone Layer. Here's Why the Fight Against Climate Change Is Different
https://time.com/5681661/climate-change-ozone-history/
Quote
The discovery of the ozone hole was sometimes called a “focusing event” — an event that focuses public attention on a particular problem. The effects of climate change are beginning to be more and more perceptible to different people, but they are not yet as obvious as the ozone hole. It might have to be that a big piece of Greenland falls into the sea and sea levels rise by a foot — that would get us thinking about climate change. But the slow nature of climate change doesn’t lend itself to that kind of shock value.

This particular summit just doesn’t seem like any kind of analogy to the ozone issue. We [in the U.S.] actually were the leaders on ozone depletion and on smog, and frankly, we’re doing so badly right now on environmental issues. We’re not going to be the leaders. We’re not going to go into this summit and say anything that will help to create an international agreement.
SHARKS (CROSSED OUT) MONGEESE (SIC) WITH FRICKIN LASER BEAMS ATTACHED TO THEIR HEADS

kassy

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Re: Ozone hole trend
« Reply #5 on: May 14, 2020, 08:06:46 PM »
What fresh hell?

Ozone layer: Concern grows over threat from replacement chemicals

Substances used for air conditioning in almost all new cars are building up in the environment and may pose a threat to human health, researchers say.

These "ozone friendly" chemicals have been introduced to replace products that were damaging the ozone layer.

Now widely used across industry, these alternatives do not break down in the environment.

Scientists have now found increasing levels of these chemicals in Arctic ice samples dating back to the 1990s.

...

However, there are now concerns that the solution may be inadvertently damaging the environment and threatening human health.

Canadian researchers, studying ice samples from the Arctic dating back to the 1990s, have found "dramatically" increasing levels of ozone replacements called short chain perfluoroalkyl carboxylic acids (scPFCAs).

"We're seeing much, much larger levels, on the order of 10 times higher now than we saw before the Montreal Protocol," said Prof Cora Young, from York University in Toronto, the study's corresponding author.

"We don't know a lot about them and their potential toxicity, but we do know that we are committing the environment to a great deal of contamination."

The compounds being detected in the Arctic are in the same class as perfluoroalkyl substances, or PFAS, sometimes called the "forever chemicals".

These long-lasting chemicals are found in everything, from furniture to clothing to food wrapping to drinking water.

There is growing concern about the role of PFAS in serious health conditions including cancer, liver damage and decreased fertility.

The related products, found in the Arctic ice samples, do not break down in the environment and current water filtration technology is unable to remove them.

The scientists expect levels of scPFCAS to increase markedly in the future.

Car trouble ahead?

As part of the efforts to replace CFCs, car manufacturers around the world agreed to use a different coolant in air conditioning called HFC-134a which was introduced in 1992.

While HFC-134a was less damaging to the ozone layer, it was unfortunately a very powerful greenhouse gas, around 1,400 times more warming that CO2.

So manufacturers in the US and Europe agreed to phase out HFC-134a and by 2017 all new cars had to use a different coolant for air conditioning called HFO-1234yf.

While this chemical doesn't damage ozone, and is not a greenhouse gas, it does unfortunately break down to produce short chain PFCAs.

"It has a very low global warming potential, but has a much higher propensity to form these persistent products," said Prof Young.

https://www.bbc.com/news/science-environment-52663694

Producing Ourselves to Death.  >:(
Þetta minnismerki er til vitnis um að við vitum hvað er að gerast og hvað þarf að gera. Aðeins þú veist hvort við gerðum eitthvað.