Jeffrey D. Sachs is Professor of Economics and Director of the Earth Institute at Columbia University. He is also Special Adviser to United Nations Secretary-General on the Millennium Development Goals.
By Jeffrey D. Sachs
The past half-century has been the age of electronic mass media. Television has reshaped society in every corner of the world. Now an explosion of new media devices is joining the TV set: DVDs, computers, game boxes, smart phones, and more. A growing body of evidence
