Worth is a measure of value and value is a measure of usefulness or importance. Ecology is a self-perpetuating system that depends on itself to produce itself. Everything in it depends on everything else in it, so its value is to be able to continue itself. Ecology is valuable to ecology.
What's really funny is that humans don't even seem to respect their own worth, as humans depend on ecology to survive, yet they seem hell-bent on destroying it so that they can't survive anymore. An abnormal growth that spreads until it kills its host.
You're asking a nonsense question. If humans didn't exist, the concept of worth wouldn't exist either, other than in the context I described in my first paragraph.
