Ecology is nearest in scale to General Systems Theory. Involves both natural and human systems. Sustainability is not static stability Complex evolving dynamic equilibrium. Characterized by evolution and adaptation. Involves ecosystem engineering, with lots of human intervention Regenerative studies, in restoration ecology.
Many specialties are narrow.
Natural systems science has 13 billion years of experience. Can do empirical refinement. General System education maxims. His ideal of a systems education program From astsys, physys, chemsys, geosys, biosys have all existed at the same time. Noone discusses across this discipline.