Big Heat : CO2 in the atmosphere will bring us a back a new carboniferous era.
Big Freeze : rise of global temperature will change ocean streams regulation and will make the Gulf Stream disappear, which in turn will freeze Europe and north America or
Universe will expand indefinetely and mid energy level will fall forever until every star burns out and everything freezes to death for ever
Big Crunch : Universe will cease to expand and will contract again, to the Big Crunch and a new Big Bang to come.
Big rip I don't know of.
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