Is it time to look forward with the sixth extinction looming on the horizon? Carbon dioxide level has been rising since the 1960's, to make this earth space ship work we would need to cut to about 1/2 the people, 1/5 the oil, 1/2 the coal, 1/2 the animals... long term. Without quick and effective action, the Co2 level will be the inciter of the sixth extinction... where most of the current organic life is replace with other organic life. The species homo sapiens will be replaced by a new species. We are a species in transition. But for now, we are in a overpopulation crisis.
Our biggest human failing is our inability to cooperate on a big scale. Political groups want to keep us in "tribes" at odds with each other. This allows the group masters to accumulate wealth, power, or ego driven ego growth. It is what they get out of it all that drives them and their egos. War allows the conquering tribe to steal the wealth and technology of the conquered.
To foster cooperation, we need to reduce the hatred for others, and this must be learned as children. UN Declaration of Rights should be expanded to no allow the teaching of hatred and violence against others. This is one of the things that forces tribe mentality onto we, the people. We need to get along.
That would make war morally/ethically wrong as described by the UN... so warring nations would be wrong by UN standards...
Aggression is always wrong, defense is defensible. Competition is the foundation of aggression along with local overpopulation, allowing excess people to be wasted in conquest. It is one more result of overpopulation. And the circle closes.