Is the sentence ' GRASS IS GREEN ' a universal truth? [closed]

narration

The category of "universal truth" is a little vague and imprecise - it is better to think of it as "generally accepted as true." However, and unfortunately, I can't think of a better term.

(Compare He said "All swans are white" -> "He said that all swans are white." despite the fact that there are black swans in Australia.)

"Grass is green" is such a statement despite there being other shades of grass, including black.

Thus it is not necessary to backshift the tense in reported speech:

"He said that grass is green."

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