We live in an age of anxiety. People everywhere fear the next terrorist attack. Meanwhile, we slowly grow numb to Iraq’s endless string of kidnappings and suicide bombings. Between bird flu, tsunamis, and loose nukes, our list of fears is getting longer. So, we asked 21 leading thinkers: What is one solution that would make the world a better place? Here are their answers.

(1) A Global Magna Carta By Garry Kasparov
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(2) Save the Russians! By Nicholas Eberstadt
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(3) Masters of Their Domain By Mikko Hypponen
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(4) A Patently Simple Idea By Sebastian Mallaby
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(5) Fund What Works By Esther Duflo
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(6) 450 Ways to Stop Global Warming By Bill McKibben
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(7) Time for a Sea Change By Paul Saffo
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(8) A Shot of Prevention By Seth Berkley
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(9) An Embarrassment of Riches By Howard Gardner
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(10) Flip the Switch By Amy Myers Jaffe
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(11) No Representation Without Taxation By Philip Bobbitt
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(12) How to Stop a Serial Killer By Jeffrey D. Sachs
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(13) The World for Sale By C.K. Prahalad
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(14) A Radical Solution By R. Scott Appleby
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(15) How to Win By John Arquilla
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(16) The Second Sex By Stephen Lewis
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(17) Take Your Vitamins By Bjørn Lomborg
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(18) The Nuclear Option By Lt. Gen. William E. Odom
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(19) Legalize It By Christopher Hitchens
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(20) A Smarter Superpower By Joseph S. Nye Jr.
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(21) A Chorus of Solutions By Thomas Homer-Dixon
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