Of course, B. Fuller's point was not that we should build generations spaceships. It was that we are already living on one, and life of all forms has been on this one for billions of years.
But there are problems. We did not get an instruction manual with our generations spaceship. There is no skilled repairman to call when we mess up. There is not even a Help Desk to call. We have difficulty contacting everyone on our spaceship, and we may not be able to understand them. Some people may be pulling in opposite directions from us.
We do know that we are heading into uncharted territory: a human population of nine billion in 2050 and eleven billion in 2100. All of them will be demanding a higher standard of living, much like ours. They will seek to reduce income and wealth inequalities across and within countries. We made it into the highly developed world with the aid of 19th century technology (sometimes enhanced). If those other folk use those technologies, it might not be nice. So far we have dealt with such problems with human ingenuity and perhaps an overt willingness to bulldoze the other occupants of our spaceship out of the way (to extinction).
Maybe we can build a Dyson Sphere, encompassing our sun and providing habitat for trillions of people. There may
already be one or two Dyson Spheres working. http://www.sciencealert.com/researchers ... phere-star
Or maybe Jesse Ausubel can come up with an even better idea. I am less than optimistic about such solutions, but what do I know? https://phe.rockefeller.edu/docs/Di%20R ... nglish.pdf
It could be that the problems of a manufactured generations spaceship would be less than the problems that we now face. Even if that is not true, we really ought to be working on problems that present themselves to us now. It is much, much more than climate change.
One of the most dangerous problems is income and wealth inequality. We currently have in place a pirate administration that seeks to increase those inequalities. I am not sure that there is an organized body that is boldly committed to reducing them.
“The truth is, we know so little about life, we don’t really know what the good news is and what the bad news is.” Kurt Vonnegut