Tibetan antelopes live on the plains of Tibet     1     the air is thin     2     (watch) them move slowly across the green grass, I’m struck by their beauty. But the 1980s and 1990s were bad times for the Tibetan antelopes when they were     3     (illegal) hunted for their valuable fur. Their habitats became smaller because new roads and railways     4     (build).As a result, the population of the Tibetan antelopes dropped by more than 50 percent. In order to prevent this species from extinction, the Chinese government took     5     (effect) measures to place it under national     6     (protect).Luckily, the antelope population has recovered. However, the government does not intend     7     (stop) the protection programmes, since the     8     (threat) to the Tibetan antelope have not yet disappeared. Only when we learn to exist in harmony     9     nature can we stop being     10     threat to wildlife and to our planet.

Dear fellow students,

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Dear fellow students, let's take action right now!

5 . We all know that forests-especially rainforests-absorb carbon dioxide and produce the oxygen that all living things depend on. It’s no wonder that they have been named the lungs of the planet. Today, after the big fires in the Amazon, Alaska, Greenland, and even Siberia, it’s very clear that we need to grow a forest that is fireproof. That’s not an impossible dream. We can grow seaweed forests that are fireproof because they are underwater.

Seaweed can store carbon and help reduce the influence of global warming. Now, seaweed is being farmed in small ocean farms to be used for food, medicines, and beauty products. If seaweed can be grown on a large scale(大规模地), it could help to fight against global warming.

“Seaweed is finally having its moment in the spotlight,” said Halley Froehlich, a scientist at the University of California. She is the lead author of a new study published in Current Biology. The study shows that large-scale seaweed farming could be used to cancel out land-based carbon emissions and it mapped the areas of the oceans where seaweed could be grown.

Now, only 3.8 percent of the US waters off the coast of California are being used to grow seaweed but that is just 0.065 of the ocean that can be farmed. In fact, 48 square kilometers of the world’s oceans can be used for seaweed farming.

For seaweed farms to be part of the global solution, they will have to be much larger. To create underwater forests, seaweed would have to be grown, harvested and then sunk into the deep ocean so that the trapped carbon could be buried for years to come.

While it sounds like a good plan on paper, “The technology doesn’t yet exist” to keep seaweed in the deep ocean, said Froehlich. “Hopefully this paper encourages conversation among engineers and economists about what it would take for the actual tools to be put in place.”