You need air flowing through the boat. I second alternative is to get a smoke detector of some kind.
Hope it helped!
There has to be one side with a high concentration and another side with a lower concentration
No, this is false!
Renewable resources can be syntesized by humans, or not: some of them can, and some can't. This is not what makes them renewable, instead it's the fact that they will still be present in the nature after usage - they will be replaced (the sun will still shine tomorrow even if we harvest its power).
