Sustainable Development in Future Centuries

In a world that is in chaos politically, socially, and environmentally, how can the human race sustain another 100 years?

Do we have the responsibility to be stewards of the environment or let it recover from our use on its own? If our society or nation uses more resources than the natural world can sustainably support, but other nations use less, are we then responding to them for the consequences of overuse? Or are they the losers in a competitive game of resource “musical chairs”?