Re: The beginning
I think the best steps we can take to creating a Trek-like planetary Utopia are to reduce world population as rapidly as we can while still acting peacefully and humanely - namely, by helping women everywhere get easy and affordable/free access to birth control.
It may not be a particularly glamorous effort, and even if the species-wide reproduction rate fell to below the replenishing rate tomorrow, it'd still take decades, maybe centuries, to arrive at an ideal total world population, but it's the best idea I've heard so far.
Its definitely a big piece of the puzzle.
"Just give me two seconds, alright, you mad bastard!" - Montgomery Scott, Star Trek Into Darkness