-The Economist   The world’s population will reach 7 billion at the end of October. Don’t panic IN 1950 the whole population of the earth—2.5 billion—could have squeezed, shoulder to shoulder, onto the Isle of Wight, a 381-square-kilometre rock off southern England. By 1968 John Brunner, a British novelist, observed that the earth’s people—by then 3.5 billion—would have required the Isle of Man, 572 square kilometres in the Irish Sea, for its standing...

Have you heard of the Yangtze River Dolphin? For the longest time, it used to be found along 1,700 kilometres of the middle and lower reaches of the mighty Chinese river. The Baiji, as it is known, was white finned, a little over two metres long, had poor eyesight and relied mainly on sonar for navigation. A few decades ago, as populations along the river grew, as shipping traffic rose,...

Ankaji Bhai Gangar, a 49-year-old subsistence farmer, stood in line in this remote village until, for the first time in his life, he squinted into the soft glow of a computer screen. His name, year of birth and address were recorded. A worker guided Mr. Gangar’s rough fingers to the glowing green surface of a scanner to record his fingerprints. He peered into an iris scanner shaped like binoculars that...

  Can we agree in this country on a floor of human dignity below which we will not allow any human being to fall? No child, woman or man in this land will sleep hungry. No person shall be forced to sleep under the open sky. No parent shall send their child out to work instead of to school. And no one shall die because they cannot afford the cost of...

From the Middle East to Madagascar, high prices are spawning land grabs and ousting dictators. Welcome to the 21st-century food wars. In the United States, when world wheat prices rise by 75 percent, as they have over the last year, it means the difference between a $2 loaf of bread and a loaf costing maybe $2.10. If, however, you live in New Delhi, those skyrocketing costs really matter: A doubling in...