Firewood?
Sustainable?
How about: *polluting*, *extremely unhealthy* the reason firewood is not used that much anymore is because of the problems it comes with. Wooden gas burner is not a solution, think about the environment as well, how many wild trees would be cut down just because people will try and sell it illegally once the prices sore. It's not an alternative, is not an option, we all need to learn about environment friendly options and in the end make things better not just for us but for our future generations as well.
It will save energy but will ruin the environment which has a huge effect in the long run. I don't see it as a good alternative either. It could be a temporary solution but it also has a huge risk to the environmental situation in the future. We all know that it will take years to grow trees so cutting them would cause a huge problem in the coming days. I hope they wouldn't push it through and will consider the environment first.