Mr Bill,
I didn't expect that you would enter into ethics and morality field. Question you ask is quite simple but the answer isn't

I was reading this thread few times and what came to my mind is a giant subject of human nature.
Apparently I think it's the best question on this board since BigTex asked what is progress. Therefore my answer may be a bit long
First, let me reverse your question and it would take another shape: "Is it moral to die?". The choice is binary as we acknowledge this, and we come to another problem - Is death moral? I think it's inevitable and it's a part of natural cycle of life - we live and we die. The problem of morality goes away for a moment. As you see the question of morality of death seems to be irrelevant... We are all going to die anyway.
Let's get back to the question of survival, and change the question another time: "Is it moral to survive now?" It's the question about our activities in "the age of plenty" - why don't we commit massive suicide. If the death is moral, and survival isn't. Still, we live because our lives are invalueable and we punish people who want to take our lives. Nevertheless, the question is still irrelevant
To get this question tougher, let me ask - Were the survivors of Holocaust immoral? The question of survivng Holocaust isn't the question of ethics or morality. They survived, period. It's not a question of good and evil

Don't you think?
The question is - Were all their behaviours during Holocaust moral? I don't think so, in that kind of extreme situation our
basic instinct to survive comes before any rules and treason, murder, robbery, bribery can be efficient way to survive as long as possible. Moreover, you're in direct competition - if you don't victimize you are victimized. There wasn't
any surplus of food in concentration camps to blame the victims, even those who victimized other prisoners (KAPO) were still victims of the circumstances.
Moral rules don't apply in fight over scraps. There is no applicable moral rule to give up your life - well, it can be seen as heroism (others get more) but you have to explain it very strangely - by myth of afterlife or "superior ethics".
I would like to mention normal observation that "lone man" or "the one hero" known from Amercian movies isn't efficient in reality. To secure your own resources and to attack you need a "tribe", a group of people fighting on your side. I love the old Voltaire quote
It is said that God is always on the side of the big battalions. I would add also trained and skilled if the nukes are disposed
At last:
$this->bbcode_second_pass_quote('', 'F')irst of all that planet wide destruction is the result of individual decisions either through production or through consumption.
Yes, we are all victims of our own activity. You cannot blame anyone but our instinct to reproduce and the system which favors mass consumption which accelerates reproduction thus accelerating pressure for resources. This has been working so good for us for so many generations...
Is reproduction evil or the system which comforts reproduction? Or both or maybe only when combined with each other
$this->bbcode_second_pass_quote('', 'S')econdly, if it is clear that 'your/my/our' individual survival is only possible at a cost of someone else not making the cut then is it moral to make that decision on behalf of essentially two individuals 'him or me/them or us'?