Edit: Changed title to be more accurate.
Also here is the summary from Wikipedia on what Post-scarcity means:
Post-scarcity is a theoretical economic situation in which most goods can be produced in great abundance with minimal human labor needed, so that they become available to all very cheaply or even freely. Post-scarcity does not mean that scarcity has been eliminated for all goods and services but that all people can easily have their basic survival needs met along with some significant proportion of their desires for goods and services. Writers on the topic often emphasize that some commodities will remain scarce in a post-scarcity society.
Harmony with what?
Harmony without 150 species being driven to extinction every day by one organisms population.
Okay that’s “without”. In harmony, with what?
Are you stupid? Without humans destroying the environment.
A person never knows when they’re stupid.
I think “stability” is the word you’re looking for here. Harmony is a beautiful word, and should only be used to refer to the thing itself.
Harmony: the quality of forming a pleasing and consistent whole.
Works fine where it is. Pedantry is an ugly look.