(A)
Concerns about microplastics are not new. They’ve been growing for more than a decade. Over the past two years, however, many creative solutions
The term microplastics was coined in 2004 by marine ecologist Richard Thompson after he discovered tiny bits of plastic littering British beaches. Since then, scientists have found microplastics—fragments less than 5 millimeters wide-nearly everywhere: in the deep sea, in Arctic ice, in the air. Even inside us.
A 2019 study in Environmental Science Technology estimated humans take in up to 100, 000 bits of plastic each day. It’s not just the physical presence of plastic inside the body
For a global view of this vast issue, some scientists in 2020 created a public database to track plastic removal innovations. For example, Hong Kong Polytechnic University researchers presented
There are thousands of coral reefs (珊瑚礁) in the world; Unfortunately, however, they are now in serious danger. More than one-third are in such bad shape that they could die within ten years.
The first cause is pollution on land. The pollutants run with rainwater into rivers and streams, which carry the poisons into the ocean.
The last factor contributing to the disappearance of coral reefs is people. People sometimes crash into reefs with their boats, breaking off large blocks of coral.
A.Global warming is another reason. |
B.Many might not even last that long! |
C.Divers who walk on reefs can also do serious damage. |
D.Reefs provide a home for 25% of the fish in the ocean. |
E.Chemicals from the poisons kill reefs or make them weak. |
F.Steps must be taken now to stop over-fishing and pollution of the oceans. |
G.When the algae die, the coral loses its color and it also dies in the end. |