Hey Wayne, if you're concerned about burn marks – then buy the pre-burned bamboo

. Really! It is heated and caramelized to a dark colour, but the process degrades its integrity some. I prefer its look – it would make a nice top I think.
If you're concerned about inhaling formaldehyde from the bamboo adhesive (assuming there is any), don't be. There are more than enough enough air changes in a Mac that the small amount given off will be dispersed as fast as it can be emitted, and it becomes less of a concern as it gasses off in time (and then no smell). But any process done in China should be scrutinized more closely for quality control and chemical claims of being “green” at the source too.
If you're prone to worry- there are always the unreacted polyester resin solvents in the fibreglass interior of the boat that might be of more concern. After 3 years people still comment to me “Oh it smells like a new boat”. Yeah – but that can be a bad thing I say with my inside voice, even with copious ventilation.
In the case of a modern house that is so well sealed and airtight that you might worry about offgassing of the bamboo (or carpet etc) – you likely needn't there either. If its properly built for our climate then it will also be equipped with a Heat Recovery Ventilator (or Enthalpy Recovery Ventilator in some regions) that will bring in fresh air and remove stale air and carry the fumes away as fast as they are emitted.
