What is my color?

I was a little ball of heat
who came out of a bang…
And as I cooled
the life in me began.

They called it a cell
which first grew on me…
It took a lot of shapes called organisms
who fed on me happily.
They came out at the last…
and one among them is reading this now.

You were intelligent
who studied me in and out.
Civilizations, monuments, emotions,
weren't you wonderful!!!
decorating me beautiful.

Now you have lost your innocence
and soaked into greed…
You started to plunder me
and even your own breed.

I was once called ‘Blue’ planet,
but will be soon turning to red;
with all the wars you are fighting
and the blood you bleed.