it is the big tree,called giant tree in the future,dont destroy it in global warming

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The number 15 is a tree, you obtain it getting 6,000 sims in the dawn of civilization.
After this, Maxis will say that sims need a garbage dump and you have to build it. After
you build it, this garbage dump will tranformer to a tree while you advance in the eras.
When you get to the future, this tree is the only building that will survive of the global
warming age.
But one thing, i see that you have all the buildings in the future except number 15. Can
you say me how you have got the ozone powerplant in the story mode? Is the only building
that I don`t have.
Thanks.
(I'm Spanish and I am learning English. Sorry of the mistakes.)

Why can't ppl just answer the friggin question instead of putting random letters jeez...