Star Trek is the future example of democratic communism that would be one possibility. Anarchism (anarcho-communism) would be more like the native tribes in America, New Zealand(pacific islands) and Australia. Small groups that work together, but wouldn't need to worry too much about the things that they used too with modern construction techniques, food production, and machinary.
The problem is that the population increased to 6.6 billion people. On a planet this size, the population density of Alaska (outside of the 'big' city) or northern Canada would provide each person with whatever they want. If someone is living on the lake by the mountain, there is another lake and another mountain just a few miles away that is probably just as good.
People would have to be 100% self sufficient. They can be helped by machines and other people occasionally,
And life would be different, but it doesn't mean that it is bad.
Te movie 'Into The Wild' looked into this, I would reccommend you watch it.
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