Logs homes are made, of course, mainly of logs.  But such homes can be environment friendly.  There are many companies that are in this line of business that use wood and logs from forest areas that are sustainably  managed.  Besides, wood is a renewable resource that will not be diminished as long as proper precautions are taken and sustainable programs are carried out.And log homes from these environmentally friendly companies are not only good for the environment.  A log home is more energy efficient than others so less energy is consumed and the greenhouse gas emissions are consequently limited.  With this, owners of a log home can save up on energy costs and can help promote the environment.