However, when the circumstances change and become favourable these traits will be manifested again. Mendels examples include the return of green and wrinkly recessive traits in subsequent generations.
I'm not quite sure what you are saying here, and you did not link to any past discussion. Are you suggesting that individual moths are changing their appearance in response to the environmental changes? That is not what Mendel demonstrated.
If instead you are suggesting that the ability to produce a dark (or light colored) moth is present in the population, but is recessive, then you are not expressing an issue with natural selection which is merely a screening process, but with mutation which is a source of diversity.
But again, I don't know which if either of the above is your actual point. Please clarify.
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