Although there'll probably be religious groups who avoid this, it's thought that the majority of the world will accept homosexuality as the norm and at least 80% will allow gay marriage.
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Top 10 Most Likely Changes to Humanity in the Next 100 Years
As the world becomes more globalised, it's believed that everyone on earth will know either English, Spanish or Mandarin, so they'll become the only languages well ever need to know.
Space on land is running out as we sleek, so it's believed that the oceans will become the main location for agriculture with the constant source of water for the crops.
With different continents allowing continental currencies (e.g. The EU introducing the Euro), it's likely that the idea of eliminated exchange rates will be an easy cure for avoiding financial crises.
As the population grows, man is going to have to find themselves living and working in some unusual places, which may also involve countries becoming sectors for different kinds of work.
