On 21/10/2012 22:47, Tim Streater wrote:
In article ,
If there isn't - well, releasing small quantities of oxygen is hardly
a major risk to the environment.

Wouldn't be small if the thing went industrial. Try breathing pure
oxygen at atmospheric pressure. Your lungs will be ****ed in short order.

In the same way that the air near a coal power station is still
breathable, not having had all its oxygen removed, the air near an
industrial oxygen generator would also be breathable. Ie even on an
industrial scale this stuff is tiny compared to the atmosphere.