1 . Janet Kelly and her husband, DaQuan Davis, were out shopping one afternoon when DaQuan’s brother, Demetrius, called in a panic. Some children playing with a lighter in the downstairs apartment ______ a fire, and the whole house was on fire. ______, Janet’s two youngest children were still inside. But when they got back, they learned that their children were ______.

That’s when Janet ______ that their dog, named Blue, had played a big role in ______ their youngest daughter. Demetrius ______ the older one of the two children out first, but when he ______ for the younger one, the smoke was ______ and things were falling all around him, Blue had ______ Demetrius outside, and then he ran back into the house for the younger child. “He was circling around my daughter and ______. Firefighters arrived in minutes. They followed Blue’s sounds to ______ the child,” Janet said.

The family were especially ______ to Blue. “He’s the sweetest dog,” Janet said. “Blue will bark at strangers, but once he knows you’re OK, he’ll drop onto his back for belly rubs.” Blue has clearly been affected by the ______ and he now barks whenever he sees candles or someone lighting a cigarette. ______, Blue has become a bit of a ______ for the family. Blue, you’re the ultimate good boy

2 . As founder of the Global Water Policy Project and lead expert for National Geographic’s Freshwater Initiative, Sandra’s goal is to promote the conservation and sustainable use of the Earth’s freshwater resources.

Sandra says she grew up in New York as a Long Island beach kid. She was always a ware of the “comfort, peace, and balance” offered by the natural world, especially the environments of wetlands and rivers. Before starting work on a project, Sandra considers an area’s “geography of water”: the amount of water in the area’s basin, the population, and the agricultural use of water. The geography of water helps Sandra determine an area’s water stress. Water stress is the situation where a community is using more water than nature made available.

Sandra first became aware of the concept of water stress after reading Swedish hydrologist Malin Falkenmark’s book Water for a Starving World. This groundbreaking work linked water use, food and population. As Sandra began to understand water stress, she realized it affects everything, from a community’s development to its political security. “So many great civilizations developed alongside rivers and lakes,” she says, pointing to the ancient civilizations of Ur (between the Tigris and Euphrates rivers), Egypt (which developed on the Nile), and the Indus River Valley.

Today, Sandra points out, more than 200 rivers are shared between two or more nations. Dams and other river management techniques implemented (实施) by nations upstream have a huge impact on nations downstream. The Tigris and Euphrates rivers have their sources in Turkey, for example, but their basins are in Iraq, Kuwait, Saudi Arabia, and Syria. River management from Turkey would impact the freshwater available to these countries for drinking, hygiene (卫生), industry, and transportation.

Water management has become part of many nations’ foreign policy. Sandra points to the Mekong River Commission. The headwaters of the Mekong River are in China, although the basin is nearly 800,000 square kilometers and includes the nations of Myanmar, Cambodia, Laos, Thailand, and Vietnam. Many governments are members of the Mekong River Commission, which promotes sustainable development of the water supply.

3 . The Seychelles — that remote island chain off the coast of northern Africa is heaven for scuba divers (水肺潜水). With more than 100 islands, most of which are uninhabited, and a relatively small amount of tourists impacting the oceans and beaches, the Seychelles has some truly best scuba diving.

Fisherman’s Cove Reef

If you’re a beginner diver who loves gentle drop-offs and sea turtles, make sure Fisherman’s Cove Reef is on your scuba diving radar. The site is very popular as there’s rarely a current, it’s very shallow, and has a colorful reef with everything from eagle rays to small leaf fish, which can be very difficult to find against the seagrass and coral.

Ennerdale Wreck

If you love wreck diving, head right for the Ennerdale, a British oil tanker that accidentally sunk in 1970. Because of the medium-to-strong current and depth, it’s for divers with advanced open water cert. They’ll be able to swim around the wreck’s propellers, penetrate the frame, and likely see reef sharks and the occasional bull shark.

Baie Ternay Marine Park

The shallow, protected area of ocean has healthy and varied coral, and a lively reef. Both snorkelers and beginner divers are likely to see sea turtles grazing on the seagrass, coaching reef fish, and small eels poking out of the sandy ocean floor.   

Aldabra Atoll

It doesn’t get much more remote than the Aldabra Atoll, a UNESCO site. The coral reef continues underwater, which makes all the island’s dive sites stunning. Advanced divers can do drift dives in a channel with a chance of seeing sharks, while beginners can stay closer to the reefs, checking the various species of marine life in the Indian Ocean off their must-see list. The island is home to nearly 100,000 giant tortoises, as well as several other rare species

7 . The ocean covers more than 70 percent of the earth’s surface and the deep sea could contain as many as 100 million species. But it’s becoming worse. Overfishing, plastic pollution, rising sea levels, and climate change are to partly blame (责怪) for the ocean’s present state.     1     But there are still some things we can do to improve the situation.

People are talking about plastics more than ever after recognizing the heavy effect the material has on our planet. Every year, thousands of seabirds, sea turtles, seals, whales, dolphins, and fish are killed after mistakenly eating plastics.

    2     You can buy reusable water bottles instead of plastic ones. When buying things, take a reusable shopping bag and choose the product that isn’t covered with plastic packaging.

Keeping our coastlines clean is a simple way to help the planet. After a day at the beach, make sure you’ve taken everything with you, including rubbish.

    3     Common sun cream chemicals can harm ocean life. Search for sun cream made with eco-friendly ingredients (成分).

    4     Consider making a donation (捐赠) to an organization working to help the ocean. The American Cetacean Society helps protect the habitats of whales, dolphins, and other marine (海洋的) animals through educational programs.

Being mindful of what cleaning products you use is another effective way to reduce your effect on the earth. Chemicals like household cleaners can move through waterways and eventually end up in the sea, affecting the health of oceans and the animals in them.     5     You can often use simple ingredients like baking soda, vinegar (醋), or lemon juice to complete many household chores.

9 . Solar stills (蒸馏器) provide a clever and simple means of purifying dirty or salty water, but they work at a rather slow rate. A new material has been shown to boost their performance, and it’s made from fruit waste which would otherwise be thrown away.

In its most basic form, a conventional solar still consists of a basin of undrinkable water that is set beneath a cover. The water evaporates (蒸发) as it’s heated by the sun, condensing (凝结) on the inside surface of the cover. That condensation—which is pure, clean water-drops down the cover and is collected in a separate container for drinking. In order to warm the dirty/salty water at a faster rate, scientists have developed materials that float on its surface, transforming sunlight into heat. They commonly use carbon obtained from coal.

To seek a less costly and more environmentally-friendly alternative, Prof. Edison and colleagues at Singapore’s Nanyang Technological University looked to something that is free for the taking—fruit waste. More specifically, the scientists tried out coconut peels, orange peels and banana peels.

In a simple carbonization process, the fruit waste was heated at 850℃for a few hours, and mixed with a kind of chemical substance. Doing so transformed the fruit waste into a new material which has a very highlight-to-heat transforming efficiency.

When tested in a small solar still, this new material proved to be very effective at transforming sunlight into heat, causing the dirty/salty water to evaporate much more rapidly. And because the material is full of holes, the waters team is able to rise right through it, subsequently condensing on the inside of the still’s cover.

Prof. Edison and his team found material obtained from the coconut peels worked best, as it transformed sunlight to heat with an efficiency rate of 94%. They are now developing the technology further, and are seeking industry partners to help with its commercialization.