Three Blank Text Completion

The _________ nature of consumer culture has led to substantial _________ waste, causing irreversible environmental damage. As societal awareness increases, the once unwavering support for such practices has begun to _________, sparking a push for more sustainable alternatives.

Why not intentional for the second blank as the clue is unwavering support ?
What is the clue for remaning ?

Perhaps it can be, but it’s a lot better to support the idea of “causing irreversible damage” here