Adam Roberts on the nonsensical sci-fi future of Avatar:

This means that Earth has (a) the technology to keep our bodies endlessly young, and (b) the technology, as per Richard Morgan’s Altered Carbon books, to download human consciousness and then upload it into new bodies, combined with (c) the ability to grow cloned bodies so close to the original that they generate their own sperm and, one presumes, eggs. Add these together and Earth has solved death and created immortality. That’s the story, right there. If there’s something ‘in’ the spacewhale’s brainjuice that reverses aging, then find out what it is, synthesise it, and give it to everyone, keeping a store of cloned bodies and downloaded consciousnesses to cover occasional deaths by accident and so on: everyone’s immortal. Why are we piddling around in these lagoons spearing sushi with a stick? We’re gods now!