 All right, let's talk about another form of renewable or are they non-renewable resources and I want to talk now about metals Metals are crucial to human society since the Bronze Age the Iron Age And if you like the the modern age when it's almost a huge number of metals are being exploited for our high technology purposes Some of the fundamental ones in the past have been copper and tin to make bronze This was a fantastic discovery if you're a group of people using Wooden spears and bows and arrows the arrival of somebody with a bronze axe or a spear is bad news for you And it's better better. You just surrender and say okay. We're done We'd like to be part of your tribe because that improvement in the technology of a metal versus wood or stone Economy is dramatic Then of course we have iron so we went from the Bronze Age to the Iron Age And now we're in some other kind of situation Australia is a huge exporter of copper and iron Historically it's had major exports of tin as well, but copper and iron We're still doing this as you know we export large amounts of these metals to other countries So they're taking advantage of the availability of the resource in our country to Support the infrastructure they have in their countries. So it's a global issue. This is not localized anymore. It's global And a lot of this you could say fundamentally Surely we're going to run out of this. Eventually we'll have mined the hole of the Pilbara. There'll be a big hole We've got plenty of big holes around we've taken copper out of the ground in many parts of Australia and certainly in the world So is this in any way a renewable resource is generating itself To some degree we Could say well at the rate of current extraction of iron from iron oxides from the Pilbara It's going to last several hundred years I'm not going to be around You're not going to be around In fact, you could use the argument that's often used by all people They could say well, what's posterity ever done for me? I don't care. I would like my shares stock market my Pensioned lifestyle to sustain itself for a few more years, and then it's not my problem But that's irresponsible. Let's face it pretty unpleasant pretty selfish So we might want to worry about this or what's the time scale here for the iron ore at several hundred years There's a lot Nevertheless the rate of which we're using it and it's increasing When I say we the world is using it Eventually you can't consider digging something out of the ground which took a long time to generate to make to store To withstand the rate at which we can remove it. So in this sense, this is like a Non-renewable energy source here. We're talking about a material