And yet we’ve flashed from caveman to world wrecker in just three hundred generations. - David Brin

Nation states are archaic leftovers from when each man feared the tribe over the hill, an attitude we can’t afford anymore.

Each of us remains convinced that our own subjective viewpoint is more urgent than anyone else’s — indeed, even more valid than the objective matrix that underlies so-called reality. After all, the subjective view is a grand theater. Each of us gets to be hero of an ongoing drama. It’s why ideologies and bigotries survive against all evidence or logic.

Of course, sometimes a species’ invention only benefited itself. Goats developed an ability to eat almost anything, right down to the roots. Goats proliferated. Deserts spread behind them.
Then another creature appeared, one whose originality was unprecedented. Its numbers grew. And in its wake some other types did flourish. The common cat and dog. The rat. Starlings and pigeons. And the cockroach. Meanwhile, opportunity grew sparse for those less able to share the vast new riches—huge expanses of plowed fields and mowed lawns, streets and parking lots...
The coming of the grasses had left its mark indelibly on the history of the world.
So would the Age of Asphalt and Concrete.