According to Green Building Insider:

• If all buildings were made green, the global carbon footprint could be reduced by 15-20% annually 
• Green-designed are homes are inherently created with energy and water conservation and efficiency in mind
• Over time, not only are you helping to save and conserve the environment, you’re saving money!

Sustainable Log Buildings 

• You can rest assured that all Logspan buildings are built with sustainable timber
• Our buildings arrive unpainted. When you paint or stain yours, we recommend eco-friendly paints and stains
• “Log homes, due to natural insulation and warmer interior require less energy. Since there is a lower requirement to use heaters and other equipment, the energy consumption of log homes is lower by up to 25%”(source)