The World In 50 Years

• Diseases ranging from Alzheimer's and Parkinson's to schizophrenia and bipolar disorder will be shown to be caused by infectious agents that take advantage of genetic predisposition, says psychiatrist E. Fuller Torrey, president of the Treatment Advocacy Center. Researchers will be surprised to find that many of those infectious agents are being transmitted from animals to humans. As a result, it will be uncommon to keep cats, birds or hamsters as pets - but we'll still have dogs around, because they've been "man's best friend" for so long that we've already adjusted to their infectious agents.
  
  
• International terrorism will be brought under control because governments will realize counterterrorism is primarily a police function rather than a job for the military, says Ronald Noble, the secretary-general of Interpol. Passports and IDs will be linked to a global monitoring system, much as credit cards are today. "People will no longer be able to travel and engage in transactions with anonymity," thanks to surveillance and biometrics, he says. All this will pose "thorny issues" for a post-privacy era.
  
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• Several essayists said water will become as big a resource issue as petroleum is today. "We cannot go green without thinking blue," former White House chief of staff Leon Panetta and former Energy Secretary James Watkins say. Norman Borlaug, father of the "Green Revolution" in agriculture, says there will have to be a "Blue Revolution" to provide enough water for the planet's burgeoning population. Thus, cleaning up the oceans and providing fresh water should rank right up there with controlling greenhouse gases