Immortality

====Environmental change====
{{Unreferenced section|date=November 2022}}
Organisms otherwise unaffected by these causes of death would still face the problem of obtaining sustenance (whether from currently available agricultural processes or from hypothetical future technological processes) in the face of changing availability of suitable resources as environmental conditions change. After avoiding aging, disease, and trauma, death through resource limitation is still possible, such as [[Hypoxia (medical)|hypoxia]] or [[starvation]].

If there is no limitation on the degree of gradual mitigation of risk then it is possible that the [[cumulative probability]] of death over an infinite horizon is less than [[certainty]], even when the risk of fatal trauma [[Hazard rate|in any finite period]] is greater than zero. Mathematically, this is an aspect of achieving [[Indefinite lifespan#Actuarial escape velocity|'actuarial escape velocity']].