My attempt at a villanelle (they're really hard!)

As the final tree begins to die,
We gather round to mourn and pray
Beneath the dreary concrete sky.

Security guards with guns stand by
The barbed wire fence all night and day
As the final tree begins to die.

We can’t reach through, though some still try.
Their arms bleed black as they pull away
Beneath the dreary concrete sky.

Memories of forests growing high
are faded dreams, real as hope today
As the final tree begins to die.

Wide-eyed children still question why,
But we shake our heads, ashamed to say
Beneath the dreary concrete sky.

Above us, birds no longer fly.
Above us, the moon and stars shine grey
As the final tree begins to die
Beneath the dreary concrete sky.