An increase in earth sheltered and earth bermed homes and buildings could go a long way in reducing air pollution caused by heating and cooling various buildings. These buildings use the natural insulating effects of soil to decrease heat loss in the winter and heat gain in the summer. Many of these buildings can maintain an air temperature of about 70 degrees Fahrenheit year round, with only a few degrees of variation. Often, they do this naturally, and sometimes with great enough efficiency that other items that need heating and cooling can become partly powered by the system, like heated water.

http://earthshelters.com/

http://www.malcolmwells.com/designs.html

http://www.terra-dome.com/

http://www.formworksbuilding.com/

http://www.earthshelter.com/
(Yes, they are different sites)

http://www.roofmeadow.com/case-studies/selected-case-studies/wal-mart-5402/

http://www.roofmeadow.com/case-studies/selected-case-studies/queens-botanical-garden-visitor-adminstration-building/