If, like some extreme environmentalists, the idea of people becoming extinct from the earth appeals to you, you just might like a new book called “A World Without People” that examines this bizarre premise. According to the London Daily Mail, the book suggests that for a little while, things might run amuck as nuclear power plants meltdown, buildings corrode, and cities crumble. But soon after, Mother Nature would breathe a sigh of relief as jungles would regrow, a great menagerie of animals would fill Africa’s plains, and Britain would revert to an ancient knot of forest and undergrowth, with its patchwork of fields and hedgerows gone for ever. And mankind’s lingering contribution? How about billions of plastic bags, blowing across the earth like tumbleweed.