Sentence:  Whether any of us remain in it long will depend on what happens as a result of the technological and economic revolutions now going on in the countries of <WSD>Asia</WSD> and Africa , and also of course on how long the cold war remains cold . 
Meaning of the word marked with <WSD> tags:  the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations