Capitalism thrives on greed and rewards greed. For capitalism to survive war is crucial and it enslaves the 99% of the people for the 1%. With all this it is impossible for the world to survive because most of the people will die because of lack of food etc. Also it is more likely that we will be destroyed by a nuclear war because of capitalism.
Communism on the other hand rewards and thrives on sharing and caring. We the westerners might not be living as good as we do now but it's a sacrifice we have to make for the rest of the worlds population to have a better and more equal life. It is also crucial for the human race to survive.
So we have two choices;
1. Continue with capitalism and eradicate the human race.
2. Sacrifice our way of living for the human race to survive.