中級 美國腔 3604 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
For 3 billion people around the world, seafood provides a significant source of protein and nutrition.
But recent studies show that 33% of wild fisheries are overfished, while another 60% are fished at their maximum capacity.
In fact, over half the seafood we eat– from finfish and shellfish to seaweed and algae– isn't caught in the wild.
It's grown through aquaculture, or aquatic farming.
Farmed seafood is one of the fastest-growing food industries, expanding in volume by 5.8
But different methods of aquaculture come with different advantages and issues– some of which echo the serious problems we've seen in industrial agriculture.
So how can we avoid repeating the mistakes we've made on land, at sea?
What aquaculture approaches are we currently using, and what does a sustainable way to farm the ocean really look like?
One of the most common aquaculture methods involves large pens made of nets, where fish are farmed offshore in floating cages roughly 1000 square meters in size.
Commonly employed off the coast of Chile and in the fjords of Norway, these fish, like many industrially farmed animals, occupy stressful, overcrowded pens.
They produce massive amounts of waste, polluting the surrounding areas and potentially spreading diseases to wild species.
Worse still, since the antibiotics employed to fight disease aren't fully absorbed by the fish, they get excreted back into the environment.
Net pens are also susceptible to escapes, unleashing huge numbers of fish which compete for resources and weaken the local gene pool with genes adapted for captivity.
Escaped fish can even disrupt local ecosystems as invasive species.
Other techniques, such as man-made coastal ponds commonly used for shrimp farming in Southeast Asia, create additional environmental problems.
Just like net pens, these ponds are prone to spreading pollution and disease.
Their construction also frequently destroys important ecosystems like mangroves and marshes, which protect coastal areas from storms, provide habitats, and absorb tons of greenhouse gases.
One way to solve these problems is to farm fish on land in completely contained systems.
Tanks and raceways can recirculate and filter water to prevent pollution.
But even fully contained facilities still contend with another major hurdle: fishmeal.
About 10% of the seafood caught globally is used to feed animals, including carnivorous farmed fish.
Researchers are working on fish feed made of insects and plant-based proteins, but for now many inland fish farms are connected to overfishing.
All these obstacles can make sustainable aquaculture feel a long way off, but innovative farmers are finding new ways to responsibly farm the seas.
The most promising solution of all may be to look lower on the food chain.
Instead of cramming large, carnivorous fish into pens, we can work with natural ocean systems to produce huge amounts of shellfish and seaweeds.
These low-maintenance flora and fauna don't need to be fed at all.
In fact, they naturally improve water quality, filtering it as they feed off sunlight and nutrients in the seawater.
By absorbing carbon through photosynthesis, these farms help battle climate change, and reduce local ocean acidification while creating habitats for other species to thrive.
Shifting to restorative ocean farming could provide good jobs for coastal communities, and support healthy plant and shellfish-based diets that have an incredibly low carbon footprint.
In just 5 months, 4,000 square meters of ocean can produce 25 tons of seaweed and 250,000 of shellfish.
With the right distribution network, a series of small farms, collectively the size of Washington State could feed the planet.
Farms like these are already popping up around the globe, and a new generation of farmers is stepping up to pursue a more sustainable future.
Done properly, regenerative ocean farming could play a vital role in helping our oceans, our climate, and ourselves.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

載入中…

【環境教育】養殖漁業可以幫助解決氣候變遷嗎? (Could underwater farms help fight climate change? - Ayana Johnson and Megan Davis)

3604 分類 收藏
Hon Man Fai 發佈於 2019 年 6 月 24 日    April Lu 翻譯    Evangeline 審核
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔