It is impossible to predict with any certainty who would survive after a nuclear world war, as the outcome would depend on a range of factors, including the number and size of the bombs used, the targets selected, and the effectiveness of defensive measures.

However, it is widely agreed that a nuclear world war would have devastating consequences for human life and the environment. The use of nuclear weapons would result in immense destruction and loss of life, and the effects would be felt for years or even decades after the initial attack.

The immediate effects of a nuclear explosion would include intense heat, blast pressure, and radiation. The heat from the explosion would cause widespread fires, and the blast pressure would demolish buildings and other structures within a large radius of the detonation. The radiation released by the bomb would cause severe burns, radiation sickness, and death, and would have long-term effects on the health of those who survived.

In addition to the immediate effects, a nuclear world war would also have serious environmental consequences. The massive amounts of radioactive material released by the bombs would contaminate the air, water, and soil, leading to widespread environmental damage and long-term health effects for those who survived.

The effects of a nuclear war would not be limited to the countries directly involved in the conflict. The release of radioactive material into the atmosphere would cause global environmental damage, leading to crop failures, famine, and disease epidemics.

It is important to note that the use of nuclear weapons is prohibited by international law, and many countries have committed to working towards their eventual elimination. The international community recognizes the devastating consequences of nuclear war and has taken steps to prevent it from occurring.

In conclusion, a nuclear world war would have devastating consequences for human life and the environment, and it is impossible to predict who would survive such an event. The use of nuclear weapons must be avoided at all costs, and efforts should be made to prevent the proliferation of nuclear weapons and work towards their eventual elimination. It is essential that the international community works together to promote peace and disarmament, and to ensure that the devastation of a nuclear world war is never experienced.