What is a best/good case scenario for the future? Yes, this is a broad question. For instance, the world's population could be argued to be overpopulated or soon will be. A straight line forecast would show something that the Earth can't support at some point. Yet, as populations become more economically well off (as they move into the middle class) their population growth rate tends to slow down. China's population has had significant gains in recent years. India will probably follow. You could imagine a scenario where the same trends have similar effects in Africa. It is possible that prosperity eventually helps to solve the over-population problem. Advances in nuclear power (fission) to say nothing about possible advancements in fusion power could stabilize climate change issues. Automation could result in economic gains sufficient to just pay unneeded "workers" to stay home. We all know the worst case scenarios for the future. They may be the more likely outcomes or they may not be but they still must be considered of course. I'm interested to hear what the more positive scenarios are in your opinion (with some basis for them of course).