From this passage, we learn that nuclear exchange in the northern hemisphere would be

The evidence given so far demonstrates that a nuclear exchange in the Northern Hemisphere would have an unavoidable global aftermath making the continued existence of mankind impossible anywhere. It is also very improbable that a nuclear exchange would be confined exclusively to the vicinity of the industrialized developments indicate that a nuclear disaster would be carried into the territories of the developing countries in Asia, Africa and Latin America. These developments include the preparations being made by aggressive forces for the armed seizure of the Middle East oil fields, the nuclear missile deployment in the south of Western Europe, the establishment of military bases for the rapid deployment of forces in North Africa and the Indian Ocean and the tensions in the south Atlantic and the Caribbean.