A complete breakdown of the global ecosystem - often leading to mass extinction.
The likelihood of this depends on the extent to which humans are dependent on the ecosystem. Some lifestyles, for example, could be sustained if they were independent from the network.
Whether this can be achieved on a large scale in practice, especially during a collapse, will be a technological challenge, and whether it is something that is wanted, is an ethical question.
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How will the world end?
General FictionLots of people had ideas that the world would never end, but now there's a book that gives crazy yet true ideas that could happen in 1.75bn Years! This has a lot of scientific words in it, so if your not a science wiz then I say go grab a dictionary!
