The greenest way to build may be to fix up an already standing structure. On the far end of the regenerative spectrum is Tallgrass Vernacular, which builds only out of earthen products. How green do you want to be?
Nebraska Energy Office List of certified green builders
United States Green Building Councel (USGBC) Nebraska Flatwater Promotes green building
Omaha Stormwater Managing stormwater through construction and development
Tallgrass Vernacular Earthen building and wood-fired appliances in the Great Plains
Soil Dynamics Services & bulky recycling, wood grinding, soil screening, composting