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@Benjamin
Wrong actually - it creates pollution that kills millions a year- and does stop doing it worth the benefit? Definitely, especially in the long run - but having every corporation suddenly quit is harder than you seem to think it is.
Also - no - your completely wrong. At least in your interpretation - it is indeed a result of someone being alive - however - you can't just jump to - "therefore the fetus has moral value" the only reason the girl has value is because she isn't a fetus - not the otherway around. If she were a fetus it wouldn't apply, trying to come to your conclusion backwards is assuming your conclusion to be true, nothing more, nothing less.
In other words - trying to say that someone has value because they haven't had an abortion is technically correct, however, them not being aborted is not the cause of them gaining value - for example - if that person were to be a failed abortion, then they would still have value once they were born. It's merely the stopping of a potential life; however, until that life is definite - there is nothing to be discussed in regards to the fetus's value.
This also all assumes that a potential person's value is worth more than a actual person - I wouldn't say so.