The root cause of the growing refugee crisis is the ecological crisis, as well as the depletion of natural resources like fresh water and arable land. Syrian droughts led to the war. We will see tens if not hundreds of millions more environmental refugees in the next decade. This will either lead to more authoritarianism or we will have a breakthrough into more local systems of governance as the nationstate borders break down.
As I discuss in HSIN, we could take care of the current population with rational allocation of resources, even while shifting to renewable energy and regenerative agriculture. We just can't do it under the Capitalism economic system which only rewards short-term financial gain - or in stock markets, an increase in shareholder value.
Hence we must realize that a new system is needed quickly and begin to work on establishing it.
That book looks at the technological and social challenges which could be met, if people banned together to demand it. I am happy to see Extinction Rebellion gaining traction, as movements like this, using nonviolent direct action at scale, are the best hope to change governments and mass consciousness.