"Jeff Layman" wrote in message
...
JennyC wrote:
Came across this by accident :

http://www.zerowaste.co.nz/default,163.sm

http://www.sci-scotland.org.uk/greenhouse.html

:~))

Interesting, but I believe that PET is not particularly stable under UV
light. It would probably not be too long before the greenhouse
disintegrated.


The rotary bird scarers I made out of such bottles lasted 3 years before
falling apart. This is interesting, and gives the kids something to do, but
it's only delaying the inevitable. In fact it can be argued that it's an
environmental disbenefit rather than benefit, since the bottles used in this
way can no longer be recycled, or so I'm told.

Steve