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Just 10 streams carry 95% of all river-borne plastic into the ocean
Just ten rivers are responsible for up to 95% of all river-borne plastic trash that ends up in the sea. Silver lining: cleaning them up would have a huge positive impact.
Cheap, durable and multifunctional, plastic is one of humanity’s most successful inventions. From the 1950s to 2015, we’ve produced 8.3 billion metric tons of the stuff. By now, it’s everywhere. It’s also non-biodegradable. And that’s devastating the environment. Only 9% of all plastic waste has been recycled, and another 12% has been incinerated. That means that almost 80%—nearly 6.3 billion tons—has turned into waste with no half-life to speak of: condemned to an eternity as landfill, litter or ocean-clogging junk.
Every year, plastic kills around 1 million seabirds, 100,000 sea mammals and inestimable numbers of fish. The volume of plastic trash in the world’s oceans is currently estimated to be around 150 million tons. No less than eight million tons are added to that every year—that’s one truckload every minute. Between 0.5 and 2.75 million tons come from rivers alone.
Large rivers are particularly efficient conveyors of plastic waste to the oceans, especially in countries lacking a well-developed waste management infrastructure. Up to 95% of river-borne plastic comes from just 10 rivers, scientists at the Helmholtz Center for Environmental Research in Leipzig, Germany have found.
The scientists analysed data on both microplastic debris (<5mm) such as beads and fibres, as well as microplastic objects (plastic bottles, bags, etc.) from 79 sampling sites on 57 of the world’s largest rivers, singling out the 10 mapped out here as the biggest culprits, due to “mismanagement of plastic waste in their watersheds”.
As this map shows, eight of the rivers are in Asia.
Four are solely in China:
- The Yangtze, which flows into the East China Sea.
- The Hai He and the Yellow River, both debouching in the Yellow Sea.
- The Pearl River, going into the South China Sea.
Two others closely involve China:
- The Amur rises in Russia and flows into the Sea of Okhotsk, but for a large part of its course forms the border with China (where it’s called Heilong Jang).
- The Mekong rises in China, but touches or crosses Myanmar, Laos, Thailand, Cambodia and Vietnam on its way to the South China Sea.
Two flow through the Indian subcontinent:
- The Indus, which rises in China and crosses India, but mainly runs through Pakistan, ending in the Arabian Sea.
- The Ganges, flowing through India and Bangladesh, into the Bay of Bengal.
The two non-Asian rivers are both in Africa:
- The Nile, with two sources in Ethiopia (Blue Nile) and Rwanda (White Nile) and flowing through Uganda, South Sudan, Sudan and Egypt towards the Mediterranean.
- The Niger, rising in Guinea and flowing through Mali, Niger, Benin and Nigeria into the Gulf of Guinea.
Not all of these rivers are equally guilty. As the graph below shows, the Yangtze is the main culprit, ejecting around 1.5 million tonnes of plastic into the East China Sea. That’s more than the other nine rivers combined.
While awareness of the issue is rising, plastic pollution itself is still on the increase as well. In 2016, 480 billion plastic bottles were sold globally. By 2021, that figure will be close to 540 billion. Fewer than half of that total is currently recycled.
If current trends continue, the amount of plastic dumped into the ocean will increase to one truckload every minute today to one every 15 seconds in 2050, by which time plastic waste will literally outweigh all the fish in the ocean.
However, as the scientists from Leipzig point out, quick fixes are possible. Focusing waste management efforts on just these 10 rivers could put a serious dent in the plastic pollution trend. Halving the discharge of plastic waste in Yangtze, Ganges, Niger and the other seven rivers listed above would reduce the global flow of river-borne plastic into the oceans by no less than 45%.
Strange Maps #929
Got a strange map? Let me know at email@example.com.
How would the ability to genetically customize children change society? Sci-fi author Eugene Clark explores the future on our horizon in Volume I of the "Genetic Pressure" series.
- A new sci-fi book series called "Genetic Pressure" explores the scientific and moral implications of a world with a burgeoning designer baby industry.
- It's currently illegal to implant genetically edited human embryos in most nations, but designer babies may someday become widespread.
- While gene-editing technology could help humans eliminate genetic diseases, some in the scientific community fear it may also usher in a new era of eugenics.
Tribalism and discrimination<p>One question the "Genetic Pressure" series explores: What would tribalism and discrimination look like in a world with designer babies? As designer babies grow up, they could be noticeably different from other people, potentially being smarter, more attractive and healthier. This could breed resentment between the groups—as it does in the series.</p><p>"[Designer babies] slowly find that 'everyone else,' and even their own parents, becomes less and less tolerable," author Eugene Clark told Big Think. "Meanwhile, everyone else slowly feels threatened by the designer babies."</p><p>For example, one character in the series who was born a designer baby faces discrimination and harassment from "normal people"—they call her "soulless" and say she was "made in a factory," a "consumer product." </p><p>Would such divisions emerge in the real world? The answer may depend on who's able to afford designer baby services. If it's only the ultra-wealthy, then it's easy to imagine how being a designer baby could be seen by society as a kind of hyper-privilege, which designer babies would have to reckon with. </p><p>Even if people from all socioeconomic backgrounds can someday afford designer babies, people born designer babies may struggle with tough existential questions: Can they ever take full credit for things they achieve, or were they born with an unfair advantage? To what extent should they spend their lives helping the less fortunate? </p>
Sexuality dilemmas<p>Sexuality presents another set of thorny questions. If a designer baby industry someday allows people to optimize humans for attractiveness, designer babies could grow up to find themselves surrounded by ultra-attractive people. That may not sound like a big problem.</p><p>But consider that, if designer babies someday become the standard way to have children, there'd necessarily be a years-long gap in which only some people are having designer babies. Meanwhile, the rest of society would be having children the old-fashioned way. So, in terms of attractiveness, society could see increasingly apparent disparities in physical appearances between the two groups. "Normal people" could begin to seem increasingly ugly.</p><p>But ultra-attractive people who were born designer babies could face problems, too. One could be the loss of body image. </p><p>When designer babies grow up in the "Genetic Pressure" series, men look like all the other men, and women look like all the other women. This homogeneity of physical appearance occurs because parents of designer babies start following trends, all choosing similar traits for their children: tall, athletic build, olive skin, etc. </p><p>Sure, facial traits remain relatively unique, but everyone's more or less equally attractive. And this causes strange changes to sexual preferences.</p><p>"In a society of sexual equals, they start looking for other differentiators," he said, noting that violet-colored eyes become a rare trait that genetically engineered humans find especially attractive in the series.</p><p>But what about sexual relationships between genetically engineered humans and "normal" people? In the "Genetic Pressure" series, many "normal" people want to have kids with (or at least have sex with) genetically engineered humans. But a minority of engineered humans oppose breeding with "normal" people, and this leads to an ideology that considers engineered humans to be racially supreme. </p>
Regulating designer babies<p>On a policy level, there are many open questions about how governments might legislate a world with designer babies. But it's not totally new territory, considering the West's dark history of eugenics experiments.</p><p>In the 20th century, the U.S. conducted multiple eugenics programs, including immigration restrictions based on genetic inferiority and forced sterilizations. In 1927, for example, the Supreme Court ruled that forcibly sterilizing the mentally handicapped didn't violate the Constitution. Supreme Court Justice Oliver Wendall Holmes wrote, "… three generations of imbeciles are enough." </p><p>After the Holocaust, eugenics programs became increasingly taboo and regulated in the U.S. (though some states continued forced sterilizations <a href="https://www.uvm.edu/~lkaelber/eugenics/" target="_blank">into the 1970s</a>). In recent years, some policymakers and scientists have expressed concerns about how gene-editing technologies could reanimate the eugenics nightmares of the 20th century. </p><p>Currently, the U.S. doesn't explicitly ban human germline genetic editing on the federal level, but a combination of laws effectively render it <a href="https://academic.oup.com/jlb/advance-article/doi/10.1093/jlb/lsaa006/5841599#204481018" target="_blank" rel="noopener noreferrer">illegal to implant a genetically modified embryo</a>. Part of the reason is that scientists still aren't sure of the unintended consequences of new gene-editing technologies. </p><p>But there are also concerns that these technologies could usher in a new era of eugenics. After all, the function of a designer baby industry, like the one in the "Genetic Pressure" series, wouldn't necessarily be limited to eliminating genetic diseases; it could also work to increase the occurrence of "desirable" traits. </p><p>If the industry did that, it'd effectively signal that the <em>opposites of those traits are undesirable. </em>As the International Bioethics Committee <a href="https://academic.oup.com/jlb/advance-article/doi/10.1093/jlb/lsaa006/5841599#204481018" target="_blank" rel="noopener noreferrer">wrote</a>, this would "jeopardize the inherent and therefore equal dignity of all human beings and renew eugenics, disguised as the fulfillment of the wish for a better, improved life."</p><p><em>"Genetic Pressure Volume I: Baby Steps"</em><em> by Eugene Clark is <a href="http://bigth.ink/38VhJn3" target="_blank">available now.</a></em></p>
Meteorologists propose a stunning new explanation for the mysterious events in the Bermuda Triangle.
One of life's great mysteries, the Bermuda Triangle might have finally found an explanation. This strange region, that lies in the North Atlantic Ocean between Bermuda, Miami and San Juan, Puerto Rico, has been the presumed cause of dozens and dozens of mind-boggling disappearances of ships and planes.
A unique exoplanet without clouds or haze was found by astrophysicists from Harvard and Smithsonian.
- Astronomers from Harvard and Smithsonian find a very rare "hot Jupiter" exoplanet without clouds or haze.
- Such planets were formed differently from others and offer unique research opportunities.
- Only one other such exoplanet was found previously.
Munazza Alam – a graduate student at the Center for Astrophysics | Harvard & Smithsonian.
Credit: Jackie Faherty
Jupiter's Colorful Cloud Bands Studied by Spacecraft<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="8a72dfe5b407b584cf867852c36211dc"><iframe type="lazy-iframe" data-runner-src="https://www.youtube.com/embed/GzUzCesfVuw?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
Scientists discover burrows of giant predator worms that lived on the seafloor 20 million years ago.
- Scientists in Taiwan find the lair of giant predator worms that inhabited the seafloor 20 million years ago.
- The worm is possibly related to the modern bobbit worm (Eunice aphroditois).
- The creatures can reach several meters in length and famously ambush their pray.
A three-dimensional model of the feeding behavior of Bobbit worms and the proposed formation of Pennichnus formosae.
Credit: Scientific Reports
Beware the Bobbit Worm!<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="1f9918e77851242c91382369581d3aac"><iframe type="lazy-iframe" data-runner-src="https://www.youtube.com/embed/_As1pHhyDHY?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span>
The idea behind the law was simple: make it more difficult for online sex traffickers to find victims.