It is highly unlikely. Neptune is extremely cold and does not have a solid surface.
It will have to, in the long term; by definition, the alternatives are not sustainable. People have lived for thousands of years with renewable energy sources; we will somehow have to do this again in the future... or else.
It may be possible in the future, but today we are not able to travel that far.
Because the soil was Fertile, and farmers were able to plant crops. Mesopotamia was able to sustain life.
no the atmosphere is to thick on Neptune to breathe
no
rocks and (not joking) butter, jam and other spreads. also, it is thought to be able to sustain wine and alcohol
no but that was my question
Ecosystem
Since the planet Neptune is a gas giant, it is not a hospitable place for growing food, and I greatly doubt that anyone will ever live there or grow food there, however, the moons of Neptune, which are still not easy places to live, are nonetheless much easier places to live than Neptune, and perhaps people will some day live there and grow food there. Although even that is unlikely.
i don't think it can
No, (and Neptune does not have water because of the intense cold, water turns into ice)
Some people submit that they can do this, however, as far as is rationally possible to determine, the future is not predictable.