Why are we using arable land for solar farms when new rooftops are bare?

Helen Shaw questions a solar energy strategy where our most precious resource for food growth and biodiversity is being used for solar farms while new buildings' roofs have no panels

Homes at Cairn Homes Seven Mills development are nearly zero energy buildings.

Last week was Green Building Week and much praise was being heaped on Cairn Homes' Seven Mills development in Dublin 22. 

The homes are what’s called nearly zero energy buildings, with high energy efficiency, and boast biodiversity crafted landscaping. They look great and the design is commendable.