The need to feed a growing population is putting much pressure on the world's supply of water. With 97% of the world's water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture. Although the idea of a water shortage(短缺)seems strange to someone fortunate enough to live in a high rainfall country, many of the world's agricultural industries experience constant water shortages.

    Although dams can be built to store water for agricultural use in dry areas and dry seasons, the costs of water redistribution(重新分配)are very high. Not only is there the cost of the engineering itself, but there is also an environmental cost to be considered. Where valleys(山谷)are flooded to create dams, houses are lost and wildlife homes destroyed. Besides, water may flow easily through pipes to fields, but it cannot be transported from one side of the world to the other. Each country must therefore rely on the management of its own water to supply its farming requirements. This is particularly troubling for countries with agricultural industries in areas dependent on irrigation. In Texas, farmers' overuse of irrigation water has resulted in a 25% reduction of the water stores.

    In the Central Valley area of southwestern USA, a huge water engineering project provided water for farming in dry valleys, but much of the water use has been poorly managed.

    Saudi Arabia's attempts to grow wheat in desert areas have seen the pumping of huge quantities of irrigation water from underground reserves. Because there is no rainfall in these areas, such reserves can only decrease, and it is believed that fifty years of pumping will see them run dry.

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    A girl with blue eyes is a blue-eyed girl. A man with long legs is a long-legged man. A woman with white hair is a white-haired woman. Children who have good looks are good-looking children. What do you do when you want to buy clothes? You go to a shop. If you can find clothes that are the right size for you, and if they are ready to wear, you will probably buy them. They are called ready-made clothes. If you can not find clothes that are the right size, you will go to a tailor's shop. A tailor is a man who makes clothes. He will measure you carefully and will then make clothes for you. Such clothes are called tailor-made clothes.

    What do we call a man who is dressed badly? We call him a badly-dressed man. A woman who is dressed well is called a well-dressed woman.

    What do you wear when it rains heavily? You wear a coat that will keep the rain out. Such a coat is called a raincoat. It is made of waterproof cloth-cloth that does not let water pass through. We have a lot of rain in England. If you come to England, bring a raincoat and an umbrella. You will find them useful.

    If the floor, walls and ceiling of a room are made so that sound cannot pass through the wall, we say that the room is sound-proof. There are sound-proof rooms in all broadcasting stations.

    Fikiri Kiponda's path from accountant to marine (海洋的) conservationist was sparked by a chance encounter.    After securing his dream job, Kiponda decided he wanted more. He wasn't quite sure what he was looking for until he ran across some turtle hatchlings.

    He didn't know it was turtle. Fortunately enough he got the right person to ask and he got motivated. That person was Nkindi, a staff member at the Watamu Conservation project who later invited him to volunteer on the project. He later left his accounting job and fully devoted himself into the world of sea turtles. Now，he runs and spends his time nursing critically endangered sea turtles back to health.

    Sea turtles have been around for nearly 110 million years and are now considered highly endangered. Their preservation rests on activities of conservationists such as Kiponda as these turtles face numerous threats and signs of their extinction in the next 50 years.

    Local fishermen traditionally catch them to supplement their own low catch rates and sell them for their oil. As changes are made to accommodate more hotels for tourists, there is less available beach land for turtle nesting.

    Kiponda's passion has now spread to his community, changing their attitude towards sea life preservation with his “by-catch release programme.”

    Through this program, fishermen are now paid for returning turtles accidentally caught in their fishing nets. The healthy ones are tagged and released into the marine park while he takes care of sick and injured turtles back to health.

    Before the launch of pioneering spirit like this, turtles caught by fishermen were used for their meat and their oil extracted (提炼) for its medicinal properties.

    “Releasing the turtle back into the ocean is a very good feeling, like, you feel like you've done something concrete and I guess everybody would love to do that...so I guess it's unique work.”

    With only about 1,000 pandas left in the world, China is desperately trying to clone (克隆) the animal and save the endangered species (物种). That's a move similar to what a Texas A & M University researchers have been undertaking for the past five years in a project called "Noah's Ark".

    Noah's Ark is aimed at collecting eggs, embryos(胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A& M's College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.

    It is estimated that as many as 2,000 species of mammals, birds reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.

    This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal.

    The entire procedure could take from three to five years to complete.

    "The nuclear transfer (核子移植) of one species to another is not easy, and the lack of available (capable of being used) panda eggs could be a major problem," Kraemer believes. "They will probably have to do several hundred transfers to result in one pregnancy (having a baby). It takes a long time and ifs difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort, adds Kraemer, who is one of the leaders of the Project at Texas A& M, the first-ever attempt at cloning a dog.

    "They are trying to do something that's never been done, and this is very similar to our work in Noah's Ark. We're both trying to save animals that face extinction. I certainly appreciate their effort and there's a lot we can learn from what they are attempting to do. It's a research that is very much needed."

5 Lifestyle Choices You Will Feel in Your Bones

    YOU SPEND TOO LITTLE TIME ON THE MOVE

    "Bone is a living tissue," says Jonathan Lee, a physician at Montefiore Health System in New York City. "The more you use it, the more it will adapt and strengthen. Likewise, if it is not subjected to loading, it will waste away. "The solution? Weight-bearing exercise-even just walking. Strength training Counts too

    YOU EAT SALTY SNACKS

    A study from Japan showed that women over fifty who had high sodium (钠) intakes were more than four times as likely to have a fracture (break of. bones)As those with low sodium intakes. That's because as the kidneys(肾) excrete(排出) the sodium, calcium is reducing from the bloodstream too.

    YOU SHUT SUNLIGHTAWAY

    "Vitamin D is required for the body to successfully absorb and use calcium," Dr. Lee says. "Most Americans do not get enough sun exposure to generate enough natural vitamin D, and thus supplementation is essential." According to the National Osteoporosis Foundation, adults under 50 need 400 to 800 IU of vitamin D daily and adults 50. And older need 800 to 1,000 IU. Talk to your doctor about your specific needs based on where you live, what time of year it is, and which vitamin D-rich foods you eat.

    YOU'RE CASUAL WITH WINE

    Low levels of alcohol consumption may be good for your bones, according to a study from Oregon State University, but more than a couple of drinks a day has the opposite effect. "Too much alcohol can make it harder to absorb calcium," says Dr. Lee. Furthermore, "In women in particular, higher alcohol consumption can decrease estrogen (雌激素) levels, and this can also lead to osteoporosis(骨质疏松), "Dr. Lee says.

    YOU LIVE INANAREA WITH DIRTYAIR

    In a study recently published in the Lancet Planetary Health, researchers dealt with hospital data for 9.2 million Medicare participants in the Northeast and mid-Atlantic between 2003And 2010. They found that even a small increase in levels of pollutants in the air--may lead to an increase in bone fractures and osteoporosis in older adults. If you live in a smoggy area, use an air purifier filter at home, avoid exercising outdoors when the air quality is bad, and get screened for osteoporosis.

    Camping is a good way to spend time along with your kids and to show them how wonderful nature can be. Through camping, children can discover new things about nature, such as flowers, birds, and other small animals. Camping gives kids time to get away from all the electronics (电子) of today's culture. So it is necessary to plan exciting and enjoyable family camping trips with your children while they are young.

    When planning your family camping trip, consider the activities your kids like: games, hiking, swimming, boating, bicycling, etc. Select a camping place that has some of the activities the kids are interested in. Meal planning is an important part of your camping trip. Plan the meals together, and kids love to choose what they want to eat.

    When starting to pack for your trip, let the kids pack their own items (物品) . Each person should have his/her own sleeping bag with a luggage (行李) bag to put it in. Personal items should be packed with their sleeping bags. Encourage the kids to put their items in a certain place and always return it when they have finished using it.

    When you have arrived at your campsite, make all the camping activities a family activity, which will help children to realize how important team-work is. Everyone can have his/her own job sitting up the campsite. Meal time can be a fun time. So let the older ones help with the cooking on your outdoor camping stove while the younger ones get the picnic table ready.