world
New()
..()
for(var/turf/Tree/T in world)
var/obj/o = new/obj/Treeoverlay
o.loc = T.loc
continue
turf
Tree
icon = 'Tree.png'
density = 1
obj
Treeoverlay
icon = 'Tree1.png'
layer = 7
pixel_y=32
Problem description: Only one tree gets the overlay above it.
I became pretty annoyied so you can see I tried to use World for it.