But again, it doesn't tell us which behaviours specifically are causing the increase in rates; you can't say people are spending more time indoors, so thus the sun cures melanoma. That's not how it works. What about the distribution of people's behaviors? Is every single person spending 1-2 hours fewer outside in the sun than they used to? Or is there a segment of the population driving it down (i.e. incels, and what are their rates of melanoma btw compared to an instagram model that spends every day tanning by the pool?), with the majority of the population still getting as much outdoor time as ever? Has beach or tanning time decreased? Is there evidence of this? We know tanning bed use is a big driver. But what else? Hard to say. I don't know for sure, and neither do you.