There was a finding a few years ago that while preventing skin cancer, sunscreen was also causing people in some places to get less vitamin d which was increasing instances of colon cancer. The solution isn’t banning sunscreen, it’s making sure people get some small amount of sun or supplements vitamin d.

Being from Oz I never really considered issues with vitamin d until I moved to the UK for a few years and discovered that limited vitamin d is a real problem in winter. Im not sure on the deficiency you need for colon cancer but a few weeks of little to no Sun really messes with your head and body.