This question really depends on whether events are set in time or not. If events are set, basically if fate exitst, then no matter what I did if I travelled back in time, nothing would change. Things would occur just perhaps in different ways. For example, if i went back in time and saved someone from being killed in a car crash, they would die from choking or falling down the stairs if events were fixed.
If events are not fixed, and there is no such thing as fate, then a great deal of damage would probably be done to the world through the actions of the time traveller. For example, I could save a drowning child only for the child grow up to be a serial killer.
It's funny when thinking about possibly jepordising our own existance, like in Back to the Future. Surely, if you stop yourself from existing, then you wouldnt have existed to stop yourself, therefore you would still exist?
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