Rashlander: Code Decipher Guide

Here is the translation:

A=O
B=M
C=U
D=D
E=Y
F=
G=E
H=T
I=H
J=K
K=G
L=I
M=W
N=R
O=L
P=
Q=B
R=P
S=A
T=S
U=C
V=
W=V
X=
Y=F
Z=N

Here are the spoiled messages:
THE EARTH DWELLERS SEEM
TO CARE NOT FOR THEIR
PLANET MOTHER. THEY ARE
KILLING HER FOR THEIR OWN
COMFORTS.

A SMALL GROUP OF EARTH
DWELLERS APPEAR AWARE OF
THE IMMINENT PLANET DEATH.
THEY HAVE LEFT THE PLANET
PERHAPS FOR TO START A
NEW EARTH?

NO EARTH DWELLER IS A
SAFE BEING. ALL MUST BE
MONITORED. PROTECT OUR ORN
PLANET MOTHER.
*I think there is a typo in the second to last line.