Since MoJo’s May/June 1993 cover story, “Beach Bummer,” which alleged that most sunscreens do not prevent malignant melanoma skin cancer, and may actually promote the potentially fatal cancer, two scientific reports on the subject have been published. The first, in the October 14 New England Journal of Medicine, described an Australian study in which sunscreen users showed a significant reduction in solar keratoses, a risk factor for skin cancer. Sunscreen did not prevent cancer; it simply reduced the likelihood of developing one of ten risk factors.

The U.S. media overstated the study’s findings and neglected to report that the sunscreen used in the study was nothing like what most Americans apply. Until recently, most sunscreens available in the U.S. blocked just one type of ultraviolet light–UV-B, the rays that cause sunburn. Deeper-penetrating UV-A rays, on the other hand, are barely blocked at all. Even “broad-spectrum” sunscreens only block about one-third of UV-A. But the sunscreen used in the study blocked 94 percent of it.

MoJo’s article focused on the theory that UV-A might be the culprit in the melanoma epidemic of the last twenty years. At the time of the article, there was no animal model to prove this. But last July, as reported in Proceedings of the National Academy of Sciences, researchers at Brookhaven National Laboratories induced melanoma in fish. “In this animal model,” the researchers wrote, “90 percent to 95 percent of melanoma may be attributed to UV-A. . . . It is reasonable to extend this conclusion to humans. Sunscreens effective in the UV-B region would not protect against melanoma induction by sunlight.”

Sunscreens that largely block UV-A include Photoplex and Shade UVA Guard.

DOES IT FEEL LIKE POLITICS IS AT A BREAKING POINT?

Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

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