According to Kity Van der Heijden, Sustainable Development is based on the “three E’s”. They are: economy, ecology and equity. To begin with, we are going to explain those 3 concepts. The first one, Economy is related to the monetary system around the world, which regulates people’s consumerism. Regarding this concept to what the author says, people should make use of just the necessary resources for living and for not being greedy. The problem here is that there are a lot of industries of non-renewable which possess a lot of money. Therefore, society is not working through equity, since it deals with the use of resources equally.