I usually try to dissuade myself from using global-scale abstractions, such as calling the Earth a "system". After that, the idea that any part of the verifiable models we throw in the Earth-systems bucket is particularly stable is frankly unrealistic.
That off my chest, I would also think that the global-scale political institutions are not nearly stable enough, nor will they ever be, to sustain a global effort to alter mass-behavior in such a way to consciously control the environment either for the good of all life on earth (whatever that may be), or for the "future of humanity": depending on whose book of revelations one chooses to follow for planning humanities future.
That off my chest, I would also think that the global-scale political institutions are not nearly stable enough, nor will they ever be, to sustain a global effort to alter mass-behavior in such a way to consciously control the environment either for the good of all life on earth (whatever that may be), or for the "future of humanity": depending on whose book of revelations one chooses to follow for planning humanities future.