Planet’s ocean-plastics problem detailed in 60-year data set

Researchers find evidence of rising plastic pollution in an accidental source: log books for planktonmonitoring instruments. Matthew Warren 

Scientists have uncovered the first strong evidence that the amount of plastic polluting the oceans has risen vastly in recent decades — by analysing 60 years of log books for plankton-tracking vessels. 

Data recorded by instruments known as continuous plankton recorders (CPRs) — which ships have collectively towed millions of kilometres across the Atlantic Ocean — show that the trackers have become entangled in large plastic objects, such as bags and fishing lines, roughly three times more often since 2000 than in preceding decades.

This is the first time that researchers have demonstrated the rise in ocean plastics using a single, longterm data set, says Erik van Sebille, an oceanographer at Utrecht University in the Netherlands. “I’m excited that this has been finally done,” he says. The analysis was published on 16 April in Nature Communications. 

 Although the findings are unsurprising, long-term data on ocean plastics had been scant: previous studies looked mainly at the ingestion of plastic by sea creatures over shorter timescales, the researchers say.

Fishing for data

CPRs are torpedo-like devices that have been used since 1931 to survey plankton populations, by filtering the organisms from the water using bands of silk. Today, volunteer ships such as ferries and container ships tow a fleet of CPRs around the world’s oceans. 

(…)Each time a ship tows a CPR, the crew fills in a log book and notes any problems with the device. So Ostle and her colleagues looked through all tow logs from the North Atlantic between 1957 and 2016, to determine whether plastic entanglements have become more common.

Evidence analysis

(…)Van Sebille says that because the study focused on large plastic items, it doesn’t reveal much about the quantity of microplastics — fragments fewer than 5 millimetres long — in the oceans. These tiny contaminants come from sources such as disposable plastic packaging, rather than from fishing gear.

Nevertheless, he adds, the study demonstrates that fisheries play a major part in plastic pollution, and will provide useful baseline data for tracking whether policy changes affect the levels of plastic in the oceans. “As fisheries become more professional, especially in the North Sea, hopefully we might see a decrease,” he says.

Source: https://www.nature.com/articles/d41586-019-01252-0 (adapted).

Access: April 20th, 2019 

INSTRUCTIONS: Read the text carefully and then answer the questions from 33 to 38 by choosing the correct alternative.

Brazil corruption scandals: All you need to know

For the past three years, Brazil has been gripped by a scandal which started with a state-owned oil company and grew to encapsulate people at the very top of business - and even presidents.

On the face of it, it is a straightforward corruption scandal - albeit one involving millions of dollars in kickbacks and more than 80 politicians and members of the business elite.

But as the tentacles of the investigation dubbed Operation Car Wash fanned out, other scandals emerged.

It has led to some of those who have found themselves accused claiming they are the victims of political plots, designed to bar them from office.

What is Operation Car Wash?

Operation Car Wash began in March 2014 as an investigation into allegations that Brazil's biggest construction firms overcharged state-oil company Petrobras for building contracts.

Investigators accused directors at the firm - named the world's most ethical oil and gas company in 2008 - of skimming the extra money off the top as a bribe for awarding the contract.

Which is bad enough - but then the Workers' Party found itself dragged into the corruption scandal amid allegations of having funneled some of these funds to pay off politicians and buy their votes and help with political campaigns.

Among those accused in the scandal were dozens of politicians, and Luiz Inacio Lula da Silva - the country's extremely popular former president, known affectionately as "Lula".

Text for the questions from 38 to 50.

Sound Advice for Language Learners

1 A recent issue of a language learning magazine has

consulted a number of experts in the field of second

language acquisition. Their advice may prove invaluable for

4 those considering a language course. Ask yourself some

basic questions, they suggest. Did you enjoy studying

languages at school, for example? Can you really afford the

7 time to learn a language?

First and foremost, you have to be realistic in your

goals. If you fail to set achievable aims you are likely to give

10 up. Besides, it is worth knowing that the most expensive

courses are not necessarily the best. You should also bear in

mind that the quicker you learn a language the more quickly

13 you forget it. Sue Miller, a French teacher, attempted to

teach herself German by enrolling on a crash course.

Already fluent in three languages, her chances of making

16 progress were high. Two years on she hardly remembers

anything. “I should have chosen a regular course in order to

have more time for practice and consolidation.”

19 Sue’s comment is certainly a good piece of advice.

Internet: <www.flo‐joe.uk> (adapted).

Text for the questions from 28 to 37.

A Musical Genius

1 Beethoven is one of the most influential figures in

the history of classical music. His exceptional talent was

already evident when he was still a young man, trying to

4 survive a rather unorthodox upbringing. Indeed, his

eccentric father would often make him study music in the

middle of the night.

7 Soon, the young Beethoven's ability won him the

admiration of the leading contemporary musical figures.

However, just at the point when he was beginning to reap

10 the rewards of his early endeavors, he realized that he was

becoming deaf. Beethoven felt devastated as it was clear to

him that his increasing deafness was incurable. And yet, he

13 kept composing and his music displayed a striking change in

style, becoming both heavier in tone and larger in scale.

Internet: <www.flo‐joe.co.uk> (adapted).

Read the following text and answer question.

Importance of Aquaculture 

Aquaculture involves the art, science and business of breeding aquatic animals and plants in fresh or marine waters for human use. It also extends to the marketing of such organisms in a controlled environment. It is a kind of agriculture, and therefore, it requires inputs such as clean water and nutrients. It also requires storage for harvested produce, transportation and marketing facilities.

Inputs often depend on the species that are farmed. Species lower on the aquatic food chain usually require less input, as they feed on microorganisms and are fine in just clean water. More inputs like fish or fishmeal, cereals, or grains are required, as we get higher on the food chain with species like salmon or tuna.

All over the world, the demand for seafood has increased because people have learned that seafood as part of regular diets are healthier and help fight cardiovascular disease, cancer, Alzheimer’s and many other major illnesses.

Aquaculture will add to wild seafood, and make it _______ and accessible to all.

Aquaculture business provides tax and royalty revenue to local governments. Besides, there is also potential revenue from exports. 

(Adapted from: https://goo.gl/qcbcfY. Access: 01/25/2018)