(This is an example sentence with no context from a grammar book.)
Does that denote
It means that the objections of the environmentalists are based on morality. They think it is an immoral act to degrade the planet. They object on moral grounds rather than scientific or religious or any other grounds.
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It means that the objections of the environmentalists are based on morality. They think it is an immoral act to degrade the planet. They object on moral grounds rather than scientific or religious or any other grounds.