海洋的威胁英语作文

The oceans are the largest Eco-system on earth. They are the earth's life support system. They bring us life. The oceans produce half the oxygen we breathe, provide at least 60% of the animal protein we eat, absorb a quarter of the carbon dioxide emitted by human activities and reduce the effects of climate change. Our security, economy and survival need healthy oceans. But now the ocean is facing a huge threat.

Climate change in the sea. Besides rising surface water temperatures and sea level, impacts are or will be associated with changes in the wave climate, circulation, ice cover-fresh water run-off, salinity, oxygen levels and water acidity. Extreme weather and hurricanes impact coasts. With growing population and infrastructures, the world's exposure to natural hazards is inevitably increasing. Ocean acidification. The oceans act as a natural reservoir for CO2 The dissolved CO2 reacts with the seawater to form hydrogen ions. The uptake of anthropogenic carbon since 1750 has led to the ocean becoming more acidic, with an average decrease in pH of 0.1 units. Over-harvest from fisher. With the increasing industrialization and efficiency of fishing, we have reached a point where most fish around the world have been over-fished, and even some fish are on the verge of extinction. The more popular fish, the worse the situation will be, such as tuna. If there is a sharp decline in the number of fish around the world, it will have a negative impact on the entire marine ecosystem.

What we can do is to minimize destructive fishing activities such as trawling, carry out protection work, help fishermen maintain their livelihoods, actively adopt a low-carbon and environmentally friendly lifestyle, travel green, slow down the pace of global warming, protect the ocean and reduce the threat of the ocean.