Which environmental element is NOT listed as degrading DNA?

The choice identifying wind as not being a significant factor in degrading DNA is accurate because wind itself does not have a direct effect on the chemical structure of DNA. Environmental elements that can degrade DNA tend to cause physical or chemical damage through their actions.

Ultraviolet (UV) light and sunlight can induce the formation of pyrimidine dimers within the DNA, leading to mutations and degradation. Humidity contributes to the breakdown of DNA by promoting hydrolysis, which can destabilize the molecule. In contrast, while wind may facilitate the dispersal of contaminants or biological materials, it does not chemically alter the DNA or directly cause its degradation like the other options listed.

Thus, wind stands out as an environmental factor that doesn't degrade DNA, making it the correct choice in this context.