What is "green roofs"

Usage examples of "green roofs".

The fluttering banners, the green roofs of the booths (of ferns and reeds and boughs), the movement and life, for bodies of troops were now marching to and fro, and knights in gay attire riding on horseback, made a pleasant scene on the sloping ground with the forest at the back.

For a moment all he could do was stare, caught by the monks piercing gaze, then he eased his steed aside and waved toward the city, the green roofs of its temples rising above the walls.

The same kind of houses with attic windows and green roofs, the same kind of cathedral, the same kind of shops and stores in the principal street, and even the same kind of policemen.