You have been asked to make a speech for the annual convention of Citizens for a Greener Planet, a national environmental group, on the idea of sustainable development. Since most of your listeners are not scientists, you want to use illustrations which lay people can understand. You have decided to describe the concept by describing the social factors which brought regarding the collapse of the Easter Island civilization. You then intend to compare these events to the on-going deforestation of the Amazon rain forest. Conclude the speech by describing what should be done to make sustainable development a reality.