In high school, I remember reading a story about a future in which the ozone layer has depleted to the point that blacks were required by law to marry only whites, in order to make the population more able to deal with the UV-rays. A young black couple was on the run from authorities because they chose to marry within their race. The main story was about the couple and society, and not dealing with the science of ozone depletion. I can't remember if it was a short story or what, but it was very thought provoking thinking about how it took an environmental disaster to get people to discard any racial bigotry.
I graduated from high school in 1976, so the story had to have been written about that time or earlier. I believe it was a short story.