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Preventive intervention, though an old practice, has recently come under widespread discussion due to concerns about international terrorism and the potential availability to rogue states or terrorists of weapons of [...]

Contradictory trends in global culture toward uniformity at a superficial level but diversity at a deeper level seem likely to continue into the future. Mass media are fostering a uniformity of desires, but cultural diversity is also increasing. Demographic trends are creating a shortage of workers in the north and a shortage of jobs in the south, leading to large scale migration from south to north. Shifting from a single center of economic power to multiple centers, ideological proliferation and migration are among the factors contributing to diversification.