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J.Allen Hynek deeply regretted that he used the term "swamp gas for at the Michigan sighting;

< SNIP > J. Allen Hynek's own writings, "The press conference, however, turned out to be no place for scholarly discussion: it was a circus. The TV cameramen wanted me in one spot, the newspaper men wanted me in another, and for a while both groups were actually tugging at me. Everyone was clamoring for a single, spectacular explanation of the sightings. They wanted little green men. When I handed out a statement that discussed swamp gas, many of the men simply ignored the fact that I said it was a "possible" reason. I watched with horror as one reported scanned the page, found the phrase "swamp gas," underlined it, and rushed for a telephone.

Too many of the stories the next day not only said that swamp gas was definitely the cause of the Michigan lights but implied that it was the cause of other UFO sightings as well. I got out of town as quickly and as quietly as I could.< /snip >

http://www.cohenufo.org/sepost_66_hynek.2.html#hynekmichigan

By the way, the Scotland 1979 UFO photo(below)

is nearly identical to the McMinneville UFO photos taken in 1950...