Scandinavia has Green-Roofed Homes that are like real-life hobbit houses.
Scandinavian turf roofs of the 20th and 21st centuries can be assumed as the historical analogue of modern extensive green roofs or sod roofs.
Turf roof or “torvtak” (in Swedish and Norwegian) is a traditional roof type of Scandinavia. In contrast to an ecological and esthetical purpose of vegetation on modern green roofs, turf was supposed to be a strictly utilitarian and to protect the waterproof layer made of birch bark sheets. It was the common way to construct roofs for timbered houses in Scandinavia up to the end of the 19th century.

Although installation of a green roof usually involves higher upfront costs than a traditional roof, there are many economic benefits that can make up for this.
Improves Stormwater Management
Reduces Urban Heat Island Effect and Improves Air Quality
Insulates the Building
Reduces Greenhouse Gas Emissions
Extends Roof Life
A green roof can also provide a refuge for insects and birds that have lost their natural habitat due to urban development and the loss of green space.

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