tree design

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 * atmosphere thins according to altitude, affecting water, fire, and breathing
 * weight-based inventory limitations
 * sky islands, meteors with iron
+* trees are alive/dead. trees root into the ground. their life depends on their roots and leaves. they grow based on how much root space they have.
 
 ### underground biomes
 terrain becomes very foreign at extreme depths. the player will encounter underground biomes.