Our warming planet is expected to face serious water crisis（危机）in the coming decades — which means each nation's natural resource will be more important than ever.

    Most animals on land are known to us, but many living things underwater are not. Now let's get to know some of them.

    Sea cucumber

    Sea cucumber are strange animals living at the bottom of the sea. They wear brown or white green coats. When summer comes, they stay deep to sleep because they are afraid of heat. And when it is autumn, they move to shallow (浅的) water and get their food.

    Pike

    The pike is a kind of freshwater fish. They are good swimmers and like swimming near boats, waiting to be fed. They have sharp teeth to catch fishes. When they are young, they live in groups. However, when they grow up, they prefer to live alone.

    Cuttlefish

    A cuttlefish can swim quite fast, so it is also called rocket (火箭) fish. It has eight arms and two feelers on its head, just around its mouth. It ejects ink (喷墨) when it is in danger. Its meat is delicious, and it is often the first choice for many people.

    Octopus

    An octopus has long arms, with which to catch food and protect itself. When it is sleeping, one or two of its arms are still on duty, keeping moving. Once it feels something dangerous, it can wake up at once to take action.

    Children grow quickly, especially their feet. But many families cannot buy new shoes each time a child needs them. As a result, about 300 million children around the world go barefoot. Those children risk picking up diseases and parasites from the soil.

    Kenton Lee, an American man invented The Shoe That Grows. He explains, “It grows in three places: the front, on the side and on the back. It can last up to five years. The bottom is rubber like tire rubber. The top is just high-quality leather. ”

    Lee says he got the idea for the shoe while working as a volunteer in an orphanage in Kenya. “I just remember a little girl who wore a pair of small shoes. The shoes were so small that she had to cut open the front of her shoes to let her toes stick out. And I just remember thinking, wouldn't it be nice if there were a pair of shoes that could grow with her feet？”

    However, Lee says it was not easy to turn his idea into a reality. Finally, in 2009 Lee founded a non-profit organization called Because International. In the office of Because International, Lee keeps a pair of his own shoes to help him remember his promise.

    A pair of shoes, he says, gives more than protection. It gives a child self-worth and more chances to succeed. “Because it's a small thing that really does make a big difference to keep them healthy and happy and having more chances to succeed.”

    Kenton Lee adds that his goal is to help get The Shoe That Grows to as many children as he can around the world.

    Environmental experts warn that our planet is drowning inplastic.

    The world's cities produce 2 billion tons of trash everyyear. By the year 2050 that number is expected to rise to 3 billion tons. TheWorld Bank estimates that the largest amount of trash today, about 44 percent,is plastic. But we often have to buy packaged goods. And often that packagingis made of plastic.

    Now, that may be changing. A new environmentally-friendlyshopping model was recently launched at the World Economic Forum in Davos,Switzerland. This shopping model, called Loop, aims to replace throwawaycontainers with reusable ones.

    Loop is the idea of Terra Cycle, an American-based recyclingcompany. Its chief, Tom Szaky told the Associated Press (AP) that "removingplastics from the ocean is not enough." He said the point is to get awayfrom single-use packages. Szaky said that Loop is the future of shopping. Butit comes from an idea of the past.

    He compared it to the "milkman model" of the 1950sin the United States. Back then, someone brought milk to your doorstep in glassbottles and then left with empty bottles. These could be cleaned and used again.The result is zero-waste.

    Jennifer Morgan from the environmental non-profitorganization Greenpeace also joined in the discussion about Loop at Davos. Shesaid that "Greenpeace welcomes the aim of the Loop Alliance to move awayfrom throwaway culture and disposability." But Morgan questioned whethercompanies worldwide are ready to change their business models.

    Loop is set to launch later this year in three eastern U.S.states, and also in Paris, France and some of the surrounding area. Then Loopplans to expand to the U.S. West Coast, Toronto, Canada and Britain by the endof this year or 2020.

    People traveling long distances frequently have to decide whether they would prefer to go by land, sea, or air. Hardly can anyone positively enjoy sitting in a train for more than a few hours. Train carriages soon get crowded. Reading is only a partial solution, for the monotonous(单调的) rhythm of the wheels clicking on the rails soon makes you sleep. During the day, sleep comes in snatches. While at night you rarely manage to sleep. Inevitably you arrive at your destination almost exhausted.

    Long car journey are even less pleasant, for it is quite impossible even to read. On motorways you can, at least, travel fairly safely at high speed, but more often than not, the greater span of the journey is spent on narrow, uneven roads which are crowded with traffic.

    By comparison, trips by sea offer a great variety of civilized comforts. You can stretch your legs on the broad decks, play games, swim, meet interesting people and enjoy good food-always assuming, of course, that the sea is calm. If it is not and you are likely to get seasick, no form of transport could be worse. Even if you travel in ideal weather, sea journeys take a long time. Relatively few people are prepared to sacrifice up to a third of their holidays for the pleasure of traveling on a ship.

    Airplanes have the reputation of being dangerous and a little expensive. But nothing can match them for speed and comfort. Traveling at a height of 30,000 feet and at over 500 miles an hour is a pleasant experience. For a few hours, you settle back in a deep armchair to enjoy the flight. The real relaxation can be a free film show and some other services. An airplane also offers you an unusual and breathtaking view of the world. You really see the shape of the land. If the landscape is hidden from the view, you can enjoy the extraordinary sight of unbroken cloud plains that stretch on for miles before you, while the sun shines brilliantly in a clear sky. The journey is so smooth that there is nothing to prevent you from reading or sleeping. However you decide to spend your time, one thing is certain: you will arrive at your destination fresh and untired.

    You'll need to take a deep breath before hearing this news. An astonishing 93% of kids around the world live in environments with air pollution levels that are damaging their health, according to a new report by WHO.

    Air pollution is to blame for the deaths of 543, 000 kids under 5 in 2016, with more than one in four deaths of children under five years old being related to environmental issues. Exposure (暴露) to air pollution can damage the health of kids in a variety of ways, either causing or being associated with everything from low birth weight to childhood obesity and so on.

    "The large toll of disease and death revealed (揭示) by these new data should result in an urgent call to action for the global community especially for those in the health department WHO stated. "Strong action to reduce exposure to air pollution offers an opportunity to protect the health of children." The report stressed that health experts should communicate with families, communities and policy-makers about the serious risks of air pollution exposure. "Although more researches into how air pollution affects children's health will continue to be valuable, there is already evidence to justify strong, swift action to prevent the damage it clearly produces," WHO added.

    Disease caused by dirty air is more common in low-and-middle in some countries, especially those in Africa, South-East Asia, and Western Pacific regions. Poor countries in these areas have the highest levels of exposure to household air pollution due to the use of polluting fuels and technologies for basic needs like cooking, heating and lighting.

    Advised solutions include cleaner transport, cleaner cooking and heating fuels and technologies energy-efficient housing and urban planning, safer industrial technologies and better waste management.