Depends one what you consider the end of the world!
I think people will be around indefinitely, its hard for me to imagine a scenario where we are all gone! We are too spread out and too many of us that any realistic disaster will get rid of us (maybe a super intelligent AI but that about it!). Although I think the 21st century will have huge changes to everyday life!
If you want to know the true end – The world will be too hot for life in about 1 billion years because the sun slowly get warmer over time. In 5 billion years the sun will swallow the earth, so that’s the physical end of the earth!
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