A couple of years ago, I had the pleasure of teaching a young couple to dive (潜水) in Thailand on one of my favorite reefs (礁). The weather conditions were perfect, with mild currents and excellent sight of the beautiful ocean and the bright, vivid corals. Even with their masks on, I could see the smiles on my students’ faces.

The dive couldn’t have gone better. However, things changed as we made our way back to the boat. As we swam back along the reef, I noticed the current (水流) changing. As it did, huge quantities of trash and plastic began to flood the area. I saw small reef fish swimming amongst the straws, plastic bags and other bits of rubbish. I noticed that some of the fish were pecking away (啄) at the plastic. By the time we got back onboard the boat, there were bits of plastic floating all around us. It looked more like a trash site than the ocean.

When I got home, the first thing I did was to go online and research plastic pollution in the ocean. I was surprised to find out that over the past decade, divers and beach lovers have seen a lot of changes in the oceans. Even very remote locations were suddenly filled with plastic and other chemicals. Plastics were entering our oceans at an alarming rate—up to 12 million tons each year. This huge amount of plastic was wreaking havoc (破坏) not only on the environment, but also on the marine animals that lived in the ocean, such as sea turtles and sea birds. Some of them were sadly mistaking the pieces of plastic for food. Pollution has brought our oceans to the point of disaster, and unless we make a great change, then our oceans and all of its living things, will be at risk.

Since that unforgettable plastic-polluted dive, I have become an ocean supporter and spend my days trying to get the message out there about just how harmful ocean pollution is, not only to marine life, but also to mankind.

Then the idea came to me: I could appeal to my fellow divers to take action.

I decided to take it a step further to try and stop those companies producing single-use plastics.

7 . Rebecca, a wildlife camerawoman, was filming a documentary for the BBC in the Pacific Ocean when she saw something that made her cry: hundreds of  _______   had died because they had  _______  eaten some of the tons of plastic thrown into the sea. Beaches in Honolulu and other Pacific islands were _______ plastic toys, bottles, keyboards, pens, cigarette lighters . Seabirds as well as  other  animals like whales, dolphins, seals, turtles were suffering  _______  thrown-away plastic. The sea and the environment become more and more polluted.

At this point most of us would have felt sad and _______ but Rebecca did differently. In her hometown of Modbury she showed her _______ from the island to local shopkeepers and asked them to do one thing to help—stop using plastic _______ in their shops. To Rebecca's surprise, the shopkeepers_______ and Modbury became the first plastic-bag-free town in Britain. Shops offered  _______ cotton bags or biodegradable(可降解) bags. People in the town got used to taking a shopping bag with them to the supermarket—just like their grandparents had done before plastic bags were  invented . Later, other towns in Britain followed Modbury's  ________ . The small town of Hebden Bridge became the second plastic-bag-free town when four women there saw Rebecca's film and  ________  to act and the people there are happy to change things.

More and more towns around are becoming plastic-bag-free. Now "the bag for life" is part of the national________, and the task of reducing the use of plastic bags has become law. Since October 2015, all shops in the UK must________ five pence for each plastic bag used by each shopper. It's not enough, of course, ________  it's a good start. It also shows us that there is something we can do and that one person ________ a strong enough belief can make a big change to protect the oceans and save the seabirds and sea animals.

8 . American researchers say they have developed a method to remove carbon dioxide (CO₂) from the sea. The researchers say the process can be an additional way to help reduce CO₂ from the environment to fight the effects of climate change.

Plants and currents in the ocean absorb large amounts of CO₂ from the atmosphere. The sea is estimated to have drawn in about 30 percent of carbon emissions since the Industrial Revolution. But carbon emissions also make oceans more acidic (酸性的). It can hurt coral reefs, which are sensitive to ocean acidity. Reef damage then do damage to the growth of many kinds of sea life.

Gaurav Sant, director of UCLA’s Institute for Carbon Management, said the technology is meant to use the ocean’s natural abilities to reduce carbon levels in the sea. The process sends an electrical charge through seawater flowing through tanks on a large boat. That sets off a series of chemical reactions that turn the carbon emissions into a solid mineral that includes calcium carbonate (碳酸钙). The seawater then returned to the ocean and can pull more carbon dioxide out of the air. The calcium carbonate settles to the sea floor.

The process has already been demonstrated in California. Researchers are working on plans to launch another project in Singapore. The two projects are expected to be fully operational by 2025. Researchers say they are expected to remove thousands of tons of CO₂ per year. If successful, the plan is to build additional centers to remove millions of tons of carbon each year.

But experts say even if that amount of carbon can be removed, that is still thousands of times less than what will be needed to effectively reduce climate change. Margaret Leinen, director of an ocean research center, said, “While the process will likely be effective, I question how much effect it will have on climate change over a long period.” Sant said the success of such technology will greatly rely on “how fast you can build the centers”.

10 . Students at the Calhoun School in New York City have much more than a roof over their heads. They have a rooftop garden, with lush grass, colorful flowers and fragrant herbs. “Green roofs” are sprouting up all over, from schools to city skyscrapers. And roofs aren’t the only things going green. Architects are finding all sorts of new ways to build buildings that are easier on the environment. These schools, homes, and offices are called “green buildings”.

Normally it takes a lot of energy to run appliances. Too often, that energy comes from burning fossil fuels. So green buildings are designed to do all these things with much less energy. An energy-smart building starts with thick walls. A layer of insulation (隔热材料) traps air to stop heat from passing through. That keeps heat inside in the winter, and keeps heat outside in the summer. This saves energy for heating and cooling.

Heat pumps are another power-saving way to stay comfortable. A ground heat pump moves heat through pipes that run through the ground next to the building. A few feet under the ground, the temperature stays around 10℃ all year round. Water flowing around the pipes helps heat the building in winter and cool it in summer.

Another way to build green is to use recycled materials. That saves the cost and pollution of manufacturing something new. In the Chicago Center for Green Technology, the ceiling tiles (瓷砖) are made of pressed newspaper. The bathroom floors are tiled with recycled glass, and the stall walls are recycled plastic. Builders have found many creative ways to re-use old materials.

As more people become concerned about climate change, more buildings are going green. Green buildings produce less of the gases that warm the planet. City planners like green buildings because they save money. And they are healthier for the people who work and live inside. But you don’t need to build a whole new building. Simple changes like shading windows and planting trees can make any home greener—and a better Earth home for us all.