Not all the things can change the future in the same way.For example if i travel in the past and i move a lamp or a bed in my room or if i rip a leaf i don't make any important modification of the future,so if i return to the future nothing Is changed. Instance for example if i travel in the past to II WW and kill Hitler,in that instant another future will be created and that is different from mine.
I think the changing of the future are directly proporzional to the difference of years from your time and time in which you have travelled back,because of the butterfly effect,but also depends on the action that you do and most important to who or what you are doing that action .
I think the changing of the future are directly proporzional to the difference of years from your time and time in which you have travelled back,because of the butterfly effect,but also depends on the action that you do and most important to who or what you are doing that action .