 Let's talk about sustainable economic growth. Sustainable economic growth implies a sustainable rising national income. One of the ways this can be achieved is by fostering the sustainability of our resources. We identify two types of resources in economic growth, non-renewable and renewable. For example, oil is a non-renewable resource because there is only a certain amount of it in the world. Once it has run out, it will be gone forever. On the other hand, some resources are renewable. This means that they can regenerate themselves. For example, wood and most sources of food are renewable, like fish. To understand what sustainable economic growth is, let's first look at what makes economic growth unsustainable. Economic growth is unsustainable when we use up non-renewable resources without finding new resources to take their place, or if we use renewable resources too fast, or if the population increases too much. Let's consider oil again. Oil is a major source of energy, but what if it is used up? A new source of energy must be found to replace oil before it runs out. If not, economic growth experience today will be unsustainable tomorrow. Let's consider the fishing industry. If fishing industries are overfishing, fish stocks will fall as too many fish are taken out of the oceans without allowing them to breed sufficiently. If this happens, future generations cannot benefit economically from the fishing industry. Consider forests. The rapid cutting down of trees for economic gain without allowing for replacement will lead to deforestation. This is another example of unsustainable economic growth. An increase in population puts a huge strain on the world's resources, resulting in an inability to maintain the rate of economic growth. This too leads to unsustainable economic growth. So, what then is sustainable economic growth? It is economic growth that, one, finds substitutes for non-renewable resources that are being used up. Two, does not use renewable resources too quickly, but allows for renewal of resources. And three, controls the growth rate of the population. If we achieve these three things, we have a world with sustainable economic growth.