Novel use of all those old estate agent signs that litter our streets

Taken from the BBC website:

A Northern Ireland estate agent has come up with a novel way of recycling the firm's for sale signs.
McAfee Properties are shipping the boards out to a township in the South African city of Port Alfred where they will be used as roofing tiles.

More on this link:

http://news.bbc.co.uk/1/hi/northern_ireland/5311990.stm

What a good idea! It always strikes me as strange that when we ask how we can re-cycle anything other than the standard paper and bottles the standard response seems to be that it is just too expensive and not worth the effort.

Yet again, some practicable thinking and this chap has found a good use for what amounts to scrap plastic.

My only other thought is how does this stack up with CO2 emissions.