According to the World Health Organisation (WHO):
An estimated 24% of the global disease burden and 23% of all deaths can be attributed to environmental factors.
In other words, the health of the environmental commons and of mankind are inextricably linked.
As WHO says:
These findings have important policy implications, because the environmental risk factors that were studied largely can be modified by established, cost-effective interventions. The interventions promote equity by benefiting everyone in the society, while addressing the needs of those most at risk.