In 1996, John Tierney suggested in the New York Times Magazine article that “recycling is garbage.” He wrote, “The money spent on recycling programs should have been spent on real social and environmental problems. Recycling programs not only increase energy use and pollution, but also cost more money than the disposal (处理) of plain old garbage. Recycling may be the most wasteful activity in modern America.”

Environmental groups were quick to express their disagreement. They wrote reports on how recycling programs in cities can reduce pollution and cost less than regular garbage pickup and disposal. Michael Shapiro, an official of the US Environmental Protection Agency(EPA), said that “recycling can be good value for money, although there's still room for improvements.”

But in 2002, New York City, a pioneer of recycling, found that its recycling program was losing money, so it stopped glass and plastic recycling. Other major cities watched closely to see how New York was dealing with its remaining program (the city never stopped paper recycling). But then it closed its last landfill (垃圾填埋地), and private companies out of New York raised prices due to the increased workload of carrying away and disposing New York's garbage. As a result, glass and plastic recycling became profitable for the city again, and New York brought the program back. According to Cecil Adams of The Chicago Reader, the lessons learned by New York are relevant everywhere. He believes that, if managed correctly, recycling programs should cost cities less than garbage disposal.

    Even though the benefits of recycling over disposal are many, keep in mind that it better serves the environment to “reduce and reuse” before recycling is even considered as a choice.

I'm part of the Roots & Shoots program founded by Dr. Jane Goodall. The program is intended to make and promote positive changes in the world. As Dr. Goodall says, "What you do makes a difference, and you have to decide what kind of difference you want to make."

    In Bulgaria, where I live, homeless dogs are everywhere. Many people here turn a blind eye to them. But I cannot ignore the life of a street dog whenever I see one wandering in the street, looking for something to eat. That's why I'm no longer a food waster. When I see wasted food, I always think of a hungry dog climbing to garbage bins, searching for food that people have thrown there. When eating in a restaurant, I'm not afraid to take leftover food to feed stray cats or dogs.

    A week ago, I saw a homeless dog around the garbage bins. Immediately I knelt down, spoke to her softly and ran my hands over her. I could see that she had had puppies. I couldn't imagine how she could have been able to care for them. Hours earlier, I'd bagged up a plate of leftover fish. As I unwrapped it, she wagged her tail and sniffed at it. She ate all the fish in no time.

    It's sad, isn't it? I can't understand why many of us waste so much and think little of it. These homeless animals have taught me that food is precious. Even when I don't have leftovers with me, I'll take the time to get something from the grocery store to feed them.

    I know my power is small, so I hope that next time you see wasted food, do turn it into worthy food. You have the power to save a life!

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    The similarities between elephant and human behavior has been a curiosity to scientists worldwide. These huge beasts are not so different from us. Their devotion to their family is just as powerful as the friendships between humans. In order to prevent future elephant attacks, people must first understand the similarities between elephants and themselves.

    Because deaths are felt so deeply in elephants, memories of people harming or killing other members are not forgotten. Due to the Uganda-Tanzania War in Africa, poaching (偷猎) elephant increased during the 1970's and continued, despite government restrictions. However, ecologists like Eve Abe did not see this as simple poaching; they saw it as a “mass destruction. “Elephants that have witnessed the murder of a matriarch, are more likely to become violent and attack humans. Many aggressive elephants do not act without reason; they are suffering from Post Traumatic Stress Disorder (PTSD). At a young age, humans invade their life, kill their parents, and ultimately destroy their peaceful environment. More and more calves live neglected lives without a mother figure, and have to become a parent early for survival. Humans that had a difficult childhood or early family life also suffer from aggression and pain. Young elephants have been known to have “nightmares,” waking up suddenly and screaming. These are clearly signs of stress, as males grow up to be increasingly hostile (敌对的) humans and target certain villages where painful experiences had occurred.

    Although many see elephants as massive, violent, and simple-minded animals, their social structure is not unlike many human societies. Humans and elephants have been on parallel paths. However, if people continue practicing ignorance over the cruel treatment of these creatures, then collision will become inevitable. Cruel treatment of elephants still goes on, but by understanding the similarities between us, it can be stopped.

    Robots make me nervous—especially the ones which seem to think for themselves. I was embarrassed to admit this till I heard that Bill Gates, the founder of Microsoft, felt the same way.

Gates said in an interview with the social networking and news website Reddit: "I am in the camp that is concerned about super intelligence. First the machines will do a lot of jobs for us and not be super intelligent．That should be positive if we manage well. A few decades after that, though, the intelligence is strong enough to be a concern."

    Well, maybe I don't have to worry about my computer and kitchen equipment yet. After I use them I can always pull the plug. But in the future, machines might find a way to prevent us from switching them off. There's a terrible thought!

    Maybe the problem with computers too clever for us is not that they are evil like some we've seen in sci-fi movies. What could put us in danger is that they might be too efficient. That's what philosopher Nick Bostrom from Oxford University believes. He says that machines are indifferent to humans and in pursuit of their own goals，the destruction of people might be just additional damage. Bostrom gives us an example: A machine which might have its only goal to produce as many paperclips as possible might look at human bodies as extra material for paperclips and go after you. Because it is, well, a machine, it would not take pity on you.

    It's a good thing that American writer Isaac Asimov thought about how far robots can go and left us his three rules of robotics. They state that a robot may not hurt a human being or allow the human being to come to harm.

I'm glad my machines at home are "dumb". All my cleaner wants to take over is the carpet in my living room. Let's hope they don't create an appliance which wants to take over the world!

    As a capital city full of art and history, London is an important political centre and a huge financial marketplace. Whatever you think about London, visiting as a tourist is very different from living there. Each part of London has its own character. Some parts are richer than others, or more industrial, or have better housing.

    Let's start with the centre, the “Square Mile”. This is the oldest part of London. In the past, it was where all financial business was done. Not many people live here, but 300,000 people work here every day.

    Moving west, we come to the West End. This busy shopping and entertainment district is bursting with things to do. Take a walk down Oxford Street, and you will see big department stores like Selfridges and Harrods. Rents here are very high; a one-bedroom apartment may cost around 1,000 pounds a week. Further away is West London. This area is more residential(住宅的)and very fashionable.

    The East End contains the Port of London, which historically is where many immigrants first arrived. Waves of French, Belgians, Jews, Pakistanis and Bangladeshis have all lived here. This makes the culture of this area very various. London won the bid to hold the Olympics in 2012, so many Londoners hope that housing, education and employment for many people in this area will improve.

    It is difficult to be general about London. The city is made up of a " collection of villages”, each area with its own character and community. Put them all together, and you have London, an international capital.

    Everywhere I look outside my home I see people busy on their high-tech devices, while driving, walking, shopping, even sitting in toilets. When connected electronically, they are away from physical reality.

    People have been influenced to become technology addicted. One survey reported that “addicted” was the word most commonly used by people to describe their relationship to iPad and similar devices. One study found that people had a harder time resisting the allure of social media than they did for sleep, cigarettes and alcohol.

    The main goal of technology companies is to get people to spend more money and time on their products, not to actually improve our quality of life. They have successfully created a cultural disease. Consumers willingly give up their freedom, money and time to catch up on the latest information, to keep pace with their peers or to appear modern.

    I see people trapped in a pathological(病态的) relationship with time-sucking technology, where they serve technology more than technology serves them. I call this technology servitude. I am referring to a loss of personal freedom and independence because of uncontrolled consumption of many kinds of devices that eat up time and money.

    What is a healthy use of technology devices? That is the vital question. Who is really in charge of my life? That is what people need to ask themselves if we are to have any chance of breaking up false beliefs about their use of technology. When we can live happily without using so much technology for a day or a week, then we can regain control and personal freedom, become the master of technology and discover what there is to enjoy in life free of technology. Mae West is famous for proclaiming the wisdom that “too much of a good thing is wonderful.” But it's time to discover that it does not work for technology.

    Richard Fernandez, an executive coach at Google acknowledged that “we can be swept away by our technologies.” To break the grand digital connection people must consider how life long ago could be fantastic without today's overused technology.