I think chlorofluorocarbons contribute to the ozone thinning.
But part of the 'hysteria' about the ozone hole over the south pole was due to misunderstanding the Sun's role in creating ozone. That 'hole' (really just a reduction, not a true hole) always followed Winter at the South Pole when 3 months of no sunlight (no solar UV) led to the dissipation of the ozone that had been created the previous 9 months, coupled with the South Polar Vortex that limited the amount of atmospheric mixing between the air over the south pole and the rest of the Earth's atmosphere.
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Whiskey, women -- and astrophysics. Because sometimes a problem can't be solved with just whiskey and women.
So, following your line of reasoning, we should have been 'hysterical' all along because the thinning of the Ozone has been with us since the beginning of the atmosphere, and there should be no problem producing a chart like the one in your earlier post going back to 1890, or so? Maybe one with the source cited for those who are sticklers for sources?
I guess we must be 'mid latitudes' here as well.... would explain why our UV ratings (kindly provided by Environment Canada) have kept going up. 8's and 9's on bad days now. Not sure how high that scale goes. I was surprised when I heard the cheering about Antartica, since there was no sign it had gotten better on the ground.
Also in the news this week, renewed anticipation of the 'polar reversal' [anytime in the next 2000 years] with cursory cautions about gamma rays etc in the event, during the event... I wonder what kind of 'sunblock' we'll be using for that.
I am reminded of an episode of the TV show "The Outer Limits" where aliens genetically altered human DNA of those that wished to protect them when the sun changed suddenly into a blue giant and started emitting massive amounts of radiation. Those that didn't want to change spent the rest of their lives inside.
What episode is that ? On my over the air broadcast ( antenna ) I receive channel 56.4 ( comet tv ) . The outer limits comes on at 0030 - 0130 am. BTW, I also have cable too. Antenna tv gives me 79 channels that are not shown on cable.
The artistic human makeup along with the changed perspective of the day sky and landscape under a blue dwarf star at the end was quite unique and beautiful.
Looks like I have nothing to worry about, maxing out at UV 8 or 9 on the rare occasion we have it sunny. The readings are higher the further south you go, up to 14 in the tropics.
Although, no one has definitely shown that in the long run it is bad for us as a species either.
I would say the issue is not one of being light skinned, but rather of being thin skinned.
It is an issue, one of many, where a lot of political and economic hay is being made from an abysmal lack of understanding, evidence and repeatable science.
There is evidence of elevated UV levels in the Antarctic indicating an ozone hole by a 1914 French expedition, well prior to the advent of halogenated fluorocarbons. There is evidence of earth's magnetic field collapse and reversal which is predicted to significantly increase UV levels at the earths surface. Some may say that this has not managed to wipe out life on the earth. 'Nuf sed.
And yes, light skinned means susceptible, Lyn is right to get out the sunblock. A million Americans every year get one or another type of skin cancer linked to UV radiation. Cancer and cancer treatment really sucks... it's so much worse than sunblock.
And no, I neither sell nor use sunblock myself. Swarthy and northerly. Cave dweller.
Dr Holick has been involved in several controversies in the medical field. While at Boston University, he was asked to leave the Division of Dermatology due to his involvement advocating for the health benefits of sun exposure. He also accepted research funding for this work from a non-profit tanning bed company. Dr Holick has also been criticized by pediatricians specializing in Child Abuse due to his testimony in criminal trials supporting Ehlers-Danlos Syndrome as a potential cause of multiple fractures in infancy, which has not been substantiated by the medical literature.[4]
Ok, neither I nor Dr Holick suggested that sun exposure wasn’t going to cause any damage, in fact the opposite.
it is more a matter of least harm.
This is not some recent invention, my own father had TB in the 1930’s and the treatment in the Netherlands in those days prior to antibiotics or other modern treatments, was outdoor schools. Needless to say he did not die of TB. They had school outdoors all summer and when weather permitted, in the winter.
The current hysteria over sun exposure should show an epidemic of skin cancer in these kids, but he at least is still tootling along at 87.
The rationale Dr Holick proposes seems sound, especially if you consider the evolutionary theory. Nature has reused things in so many areas, I don’t think this theory is at all hairbrained.
Well... When we were kids the sun felt fantastic on your skin. That definitely isn't the case in recent decades when the UV is high, the feeling is not pleasant it's burning. Like most animals I avoid pain, and I don't find it difficult to believe the explanation that the UV levels have changed and can be harmful.
OTOH I have also taken the recent researches on Vitamin D to heart. I'm not generally an advocate of daily anything, but I've made an exception for Vitamin D as it seems to have noticeable benefits. And it doesn't seem likely I'd be getting enough from our scanty bit of sunshine.