Thanks DarkArts

. The disposal still remains though. You still don't want this stuff in landfill. You mention that the PV used on roof tops doesn't contain Cd. Do ALL not contain Cd? I'm not being alarmist, but a realist when it comes to commerce and greed. If PV that contain Cd are cheaper... well, you see where I'm going with this. And if just ONE PV set up has Cd in it, the gig is up. What about all those smaller units powering campers, recharging astro batteries, etc. There is a lot of misinformation, and ignorance.
Please don't think I am anti solar. On the contrary, I love the stuff. I'm miffed that Australia isn't investing in solar furnaces - a lot more efficient than PV. Damn if we don't have land a plenty for these too.
But we digress from the OP... Sorry Alex.