If we draw a broader picture of what is important to
human beings, the leveling off of sustainable
welfare in economic terms would be replaced by a definite decline in
overall human terms.
A significant number of people care about the fate of the component Σ, because it contributes significantly to the
overall mode of operation of the Earth system (such that tipping it modifies the qualitative state of the whole system), it contributes significantly to
human welfare (such that tipping it impacts on many people), or it has great value in itself as a unique feature of the biosphere.