Solar cells in the roof and nanotechnology in the walls

"It isn't cars and vehicle traffic that produce the greatest volumes of climate gas emissions – it's our own homes. But new research will soon be putting an end to all that!  The building sector is currently responsible for 40% of global energy use and climate gas emissions..."

Resource:

http://phys.org/news/2015-06-solar-cells-roof-nanotechnology-walls.html