There would be zero money systems with peer-to-peer free trade being the only methods of accumulating items and services. Humanity would be as responsible for themselves as they would be for each other. I have written about this topic in this post.
To address the issues of government and greed, I would utilize the positive benefits off Utopian Socialism to go with the free-trade society. This would assist in creating a society that could function in a money-less market. It would establish the ethical and legal guidelines for how individuals could act based on what is best for the people.
The infrastructure would accommodate those with disabilities and also have the lowest possible impact on the environment.
The primary focus of construction and breeding would be to remain as much in balance with the surrounding ecosystem as possible.