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What If All Humans Suddenly Disappeared From The Earth?
What if human history ended today?You are one of 7.6 billion people on this Earth. But what does that mean?How can those 10 ...
See To Believe on MSN25 分钟
What If Everyone on Earth Lived in One City?
By 2050, that’ll be two-thirds of the world’s population.So what does that mean? Can we accommodate this trend? Should we?What are the pros and cons of urban density? And how bad can it get?Transcript ...