Yes, these are among the reasons why moral value is not linearly additive.
The moral value can still be linearly additive, but additive over more variables than the ones you considered. For example, the existence of the species, and the existence of future members of the species.
The moral value can still be linearly additive, but additive over more variables than the ones you considered. For example, the existence of the species, and the existence of future members of the species.