 So let's start off with defining what are resources. A resource could be something in the lines of energy that we're going to use. It could be food. It could be water. It could be a variety of other possible materials that we would now consider as resources because we need them to sustain our high-tech-based lifestyles, such as everything that might go into an iPhone, everything that goes into your house, everything that goes into your car. For example, future electric cars are going to be highly consumptive of metals at levels that ordinary cars have not been to this date. So that's a resource, and it's a human-based idea. The Earth does not care about you, believe it or not. What we need to get from the Earth or are placed in the planetary system is something that the planetary system is not concerned about, but we can make use of it. So we're adapted as animals to our environment, and many of the things we use in our everyday life we possibly would not even call a resource. Food you eat, for example. Would you consider that as a resource? In some ways you should because you need it to live. And it's not something that appears spontaneously. You need food to make energy, to sustain your body. You need water, probably more important than food, and so on. So let's define a resource that way.