What do a school in the Mongolian capital Ulan Bator and the United Nations headquarters in New York have in common? Both are poorly insulated. Large amounts of energy are lost just trying to keep them warm in winter and cool in summer. It's a problem that affects millions of building across both the industrialized and developing world. But new building techniques, green energy and growing awareness are leading to change. Find out this week on Global Ideas on what the right draft and heat proofing of buildings can do across the world.