[profstasiak]

Can someone please explain, sunscreen was invented in 1938.

How can something so new be suddenly a necessity, that if you fail to use every day you will get a skin cancer?

I understand for example that antibiotics are also new and really helpful, but was skin cancer a problem in our pre-history, or pre 1938 history?

Is it caused by ozon layer destruction? Global warming? What is the reason we suddenly need sunscreen?

(Genuinly asking, not trying to take a stand)

[profstasiak]

It seems like skin cancer might be caused by sun, but is more prevalent due to other reasons.

"Melanoma rates in the United States have been rising rapidly over the past 30 years — doubling from 1982 to 2011 — but trends within the past decade vary by age. (1,6,10,11) There has been a 31.5% increase between 2011 and 2019. (12)" [0]

it doesn't make any sense for me.

The only reason could be a "terrain theory" - where a ill bodies (bad terrain) (caused by diet, sedentary lifestyle etc) is more prone to illness all over the body. So with bad terrain it might make sense that we suddenly need to use sunscreen, because we are more prone for skin cancer.

[0] https://www.aad.org/media/stats-skin-cancer