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Green Planet

Rising sea-levels: How to stop a city from sinking

MD Staff

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photo: UN Environment

When William Buco, father of five, moved to Dar-es-Salaam thirty years ago the coastline was unrecognizable to today. He could sit on the beaches and picnic with his friends. Coconut sellers came by with fresh harvests, and newly married couples posed for wedding photographs with the oceanic backdrop. Then the tide turned, and all this began to change.

Sea-levels rose and eroded the coastline. The tunnel of trees that once flanked the coastal road died from salt poisoning and rotted by the roadside. Businesses corroded along with the coastline – there were no more residents around to sell to.

“The sea waves were very violent and the water could not be managed,” explained Buco, 75, a local engineer and grandfather. “It was the lower-class people who were really affected. Their future was damaged. Opportunities were lost.”

The World Bank estimates that climate change will hit East Africa hard, forcing more than 10 million people to flee their homes by 2050.

The coastal metropolis of Dar-es-Salaam is at risk. Five million residents, many of them poor, are living in a low-lying city surrounded by an ever-rising sea.

But it’s not just the seawater. Intense rainfall in Dar-es-Salaam is flooding entire neighborhoods each year. Water accumulates in the flat city, eroding the foundations of buildings. Even when residents expend all efforts keeping homes dry – sometimes permanently cementing the bottom-half of their front doors – the stagnant water erodes the outer walls and causes them to flake away.

The situation was so stark that one man, Chacha, left his business to become an Environment Officer and protect his city from flooding. Pointing to a house submerged in water, he explained: “This area is not safe for people living here. If there’s heavy rain, the toilets are also flooding. It’s easy for people to get infectious diseases like cholera, diarrhea, typhoid and other things like that.”

UN Environment was alerted to the needs of Tanzanian coastal communities. In collaboration with United Nations Office for Project Services (UNOPS), they began building extensive seawalls along Tanzania’s coast, including over 2,400m of defense structures. The walls stop the shores from disintegrating and are scattered with scenic viewpoints for residents to enjoy.

Further inland, a network of drainage systems was carved-out to channel floodwaters to the ocean. Even before the project was finished there was already a major sea-change for the local communities.

Economic activity is now recovering on the city’s coastlines. Traders in fruits and nuts are returning. “Now opportunities are back again,” said Buco. “We can make this a place of opportunities for people to sell, people to buy, people to relax.”

The drainage systems have given reprieve to the waterlogged residential zones. Environment officer Chacha said: “We have to figure out how to take this water back to the sea. That’s why the construction of this drainage system is very important for people living in this area.”

Seawalls have now been constructed in seven sites along Tanzania’s coast, owing to the financial support from the Adaptation Fund, the Least Developed Countries Fund, and the Government of Tanzania.

On World Environment Day, the Tanzanian Vice-President Samia Suluhu gave a speech to celebrate the completion of the seawall: “Through the construction of these walls in the various parts of the country, we see the importance of the project. Kisiwa Panza [northern Tanzania] was sinking but now the residents are living well and in peace.”

In combination with the seawall, UN Environment restored vast areas of mangrove and coral habitats, both of which act as natural barriers against wave surges. This formed part of a strategy that seeks to build resilience to climate change by improving natural ecosystems.

Dar-es-Salaam – literally meaning ‘house of peace’ – is on the frontier of the fight against climate change. The building of these seawalls, along with the ecological restoration, has bought the city another 50 years of protection from rising seas, helping the metropolis to remain true to both its name and its nature.

UN Environment

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Green Planet

Dangerous Plastics Are a Threat to Us and Future Generations

Meena Miriam Yust

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Every day people make decisions about what to eat, sometimes opting for colorful fruits and veggies, sometimes finding the smell of bacon irresistible.  At the end of the day people are controlling their own health.  What is remarkable though, is the possibility that something one swallows today could have a lasting effect on future offspring – children, grandchildren, great grandchildren.  New research is finding a generational impact of certain chemicals.  This time it’s not the bacon we’re worried about – but plastics and the toxins within them.  

Twenty years ago, researchers  at Washington State University discovered accidentally that the now-infamous bisphenol A (BPA) was leaching out of plastic cages, harming the mice within.  The contamination caused abnormalities in mice eggs and fertility.  Numerous subsequent studies found BPA exposure affects adult fertility and health across species, including monkeys, fish, and humans.  Known to decrease sperm count in rats and to cause breast cancer in women, BPA was banned in 2012 by the FDA from being used in baby bottles and sippy cups.  Yet BPA is still used in many products, including epoxy resins used to coat canned foods.  A 2004 study of 2,517 people found that 93% had detectable quantities of BPA’s by-product in their urine. 

Since the toxic effects of BPA came to light, several replacement bisphenols were quickly brought to market by chemical companies and are now in widespread use.  Twenty years after the BPA toxicity discovery, by remarkable chance, the same Washington State University lab recently noticed again that something was amiss with their mice.  This time the mice were housed in cages comprised of replacement bisphenols, largely believed to be safer than BPA.  The researchers subsequently performed controlled studies with several of the replacement bisphenols including BPS, a widely used replacement.  

Results demonstrated that the new bisphenols behaved similarly to BPA, causing health problems including detrimental effects on fertility in both males and females, reported in Cell Biology in September 2018.  Scientist Sarah Hunt explained, “This paper reports a strange déjà vu experience in our laboratory.”  What the lab discovered once with BPA, it was seeing again with the replacements.  Perhaps most troubling were the long-lasting effects of the toxins.  Even if all bisphenols could be magically eliminated today, the toxic effects would still last about three generations through the germline of people already exposed.  This means bisphenols ingested today could affect the fertility of one’s great grandchildren.

The bisphenol case demonstrates that FDA bans do not necessarily solve the root problem.  Chemical companies tend to roll out similar chemicals to those that have been banned, because this is the easiest way to bring something to market quickly.  But more testing is needed before chemicals are released into the environment.  Long term problems such as generational infertility and cancer risk often cannot easily be examined in clinical trials, and environmental effects are not rigorously analyzed prior to release.  

The Washington State University study also proved that damaged and heated plastics are particularly deadly, as the damaged cages leached more toxins.  This should serve as a warning for those who microwave food in plastic containers for their families.  And it should remind us that discarded plastic bottles degrading in oceans and rivers are releasing toxins that cause irreversible infertility.

The current estimate of plastics in our oceans is approximately 150 million metric tons. By 2050, the amount is expected to ‘outweigh the fish,’ according to Jim Leape, co-director of the Stanford Center for Ocean Solutions.  A recent study has determined microplastics (small plastic particles) are present in every river and lake in Britain.  And they have been found in tap water, everywhere from the Environmental Protection Agency in Washington, DC to the Trump Grill in New York.  A study of 159 drinking water samples on five continents found that 83% of those samples were contaminated.  Plastics are everywhere, from the highest mountains to the deepest parts of the ocean and Arctic.  Nanoplastics less than 50 nanometers long have even been found in plankton, which is ingested by fish that humans eat.

Scientists are finding that plastics are disrupting marine mammals’ ability to reproduce.  Many forms of plastic including polychlorinated biphenyls (PCBs) and Bisphenol A are endocrine disruptors, meaning they affect the hormonal systems of animals.  An orca of adult age called Lulu, researchers recently found, was barren as if she was a juvenile.  Analysis revealed very high levels of PCBs in her lipid tissues.  One orca pod off the coast of Scotland has not produced a calf in 25 years.  Despite bans on PCBs 30 years ago,  toxins remain in orca mothers’ milk, and are passed from mother to baby.  A recent study published in the journal Science predicts that half the world’s population of orcas will be extinct in just a few decades due to PCB poisoning.  Researchers have also found that despite the PCB ban in Europe, levels of PCBs have not decreased, indicated that they may be leaching out of landfills.  Hormone disruptors have also been found to impair male frogs’ fertility, and to cause tadpoles to more frequently develop ovaries rather than testicles, thus skewing the proportion of males to females.  Similar problems have been found in fish.  Reproductive risks associated with endocrine disrupting chemicals span species.

Bisphenol A is known to decrease sperm count and to cause cancer in many species.  Its counterpart replacement plastics (BPS, BPF, BPAF, BPZ, BPP, BHPF… to name just a few), researchers have recently discovered, are no better.  Whether these pollutants have already affected humans is anyone’s guess, but it would be wise to view statistics during the time period since plastics became popular, starting in the 1960s, and to see if there is a significant trend over time.  

It appears there is.  Notably, a 2017 study found that sperm counts per milliliter declined by more than 50% from 1973 to 2011, with total sperm counts down almost 60%.  Two other recent studies have demonstrated that over the past few decades in the U.S. and Europe, both sperm count and motility have decreased.

The United Nations Environment Assembly (UNEA) recently debated a proposed legally binding treaty to address plastic pollution.  One objective of the proposed treaty was to phase out single use plastics by 2025.  Norway also suggested a global agreement for handling ocean plastic pollution.  Sadly, the U.S. was the largest voice against the proposed treaty and the proposed global waste disposal plan.  

Eventually a non-legally-binding agreement was reached in which the U.S. watered down the language to “significantly reduce” plastics by 2030, eleven years from now.  One UN delegate described the Trump representatives as “trying to remove all targets and timelines.”  

Meanwhile, the U.S. has been exporting large quantities of plastics overseas for years, historically mostly to China.  In the previous year, 70% was exported to China and Hong Kong.  But in 2018, China banned imports of plastic waste.  Since the ban the U.S. has looked to poorer nations for its overseas garbage dump.  Unearthed, Greenpeace’s research group, has found that in the first six months of 2018, almost half of U.S. plastic waste was sent to developing countries: Thailand, Malaysia, and Vietnam.  U.S. plastic waste exports to Thailand went up by nearly 2,000% this year.  

Most developing nations do not have sufficient recycling infrastructure to properly handle plastic waste.  On Earth Day 2018, the top producers of mismanaged ocean plastic waste were ranked by tons of waste.  The top five after China were Indonesia, the Philippines, Vietnam, Sri Lanka, and Thailand.  In some cases as in parts of the Philippines, recycling is done laboriously by hand, picking bottles out of large dumps.  As this is very difficult and time consuming, large quantities find their way into oceans and rivers.  Sadly and not surprisingly, the Pasig River in the Philippines transports approximately 72,000 tons of plastic downstream, and has been declared “biologically dead” since 1990.  Instead of helping these countries to develop recycling infrastructure, we are sending them more toxic waste.

We might think we are kicking the can down the road by sending plastics overseas but they will wash right back up on the Hawaiian and California coast.  Beachgoers might witness solid litter washing ashore, or unearthed from the stomachs of dead whales.  Or they might not notice the pollution  — instead unknowingly consuming microplastics in their next Ahi Tuna sandwich.  On the East Coast, one might encounter them in a glass of water at the Trump Grill in New York.  There is only one world sink after all.  Tossing poison to the other end of the tub only works for so long – it will inevitably, over time, mix and wash back to your side of the water.  And when one of us is diagnosed with cancer, do we really know the cause? 

It is instructive to remember the orca Lulu, a mammal like us, who no longer produces eggs.  And to remember that if sperm counts continue to decline at the present rate, they will soon reach levels where it becomes difficult to have children.  By then, the world’s water supply may be irreversibly contaminated and an enforceable treaty will be too late.

Postponing a legally binding treaty may put us on the path of our fellow mammals the orcas, half of which already face inevitable extinction worldwide.  And we can not forget the tragedy of the orca Tahlequah, who last summer carried her dead calf for a record 17 days and 1,000 miles in mourning. 

Eleven years may be too late.  

Author’s note: this piece first appeared in CommonDreams.org

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Green Planet

We’re gobbling up the Earth’s resources at an unsustainable rate

MD Staff

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George Monbiot, a correspondent for Britain’s The Guardian newspaper and known for his environmental and political activism, has made a surprising call for people in the United Kingdom to cut the use of cars by 90 per cent over the next decade.

Many will balk at this idea but it is perhaps sounding somewhat less bizarre after the release by the United Nations of a new report which paints a scary picture of the rate at which we are gobbling up the Earth’s resources.

The global automobile industry requires huge amounts of mined metals as well as other natural resources such as rubber, and the switch to electric vehicles, while a necessary move to curb air pollution and greenhouse gas emissions, is not without some adverse environmental consequences: large-scale lithium mining for the batteries required to run electric vehicles could cause fresh environmental headaches.

UN Environment’sGlobal Resources Outlook 2019, prepared by the International Resource Panel, examines the trends in natural resources and their corresponding consumption patterns since the 1970s. Its main findings:

The extraction and processing of materials, fuels and food contribute half of total global greenhouse gas emissions and over 90 per cent of biodiversity loss and water stress

Resource extraction has more than tripled since 1970, including a fivefold increase in the use of non-metallic minerals and a 45 per cent increase in fossil fuel use

By 2060, global material use could double to 190 billion tonnes (from 92 billion), while greenhouse gas emissions could increase by 43 per cent

Besides transport, another major consumer of resources is the rapidly growing building sector.

Cement, a key input into concrete, the most widely used construction material in the world, is a major source of greenhouse gases, and accounts for about eight per cent of carbon dioxide emissions, according to a recent Chatham House report.

Both concrete and clay manufacturing (for bricks) include energy-intensive processes for raw material extraction, transportation, and fuel sources for heating kilns. 

Building quality sand is currently being extracted at unsustainable rates.

Urgent energy transition needed

Sixty-six per cent of global energy is provided by fossil fuels (World Bank, 2014). UN Environment Acting Executive Director Joyce Msuya has called for speeding up the energy transition from fossil fuels—coal, oil and gas—to renewable sources of energy like wind and solar.

“We need to see a near-total shift to renewable sources of energy, which have the power to transform lives and economies while safeguarding the planet,” she says in her letter to participants of the recent UN Environment Assembly in Nairobi, Kenya.

The call comes just a few days after Norway’s US$1 trillion sovereign wealth fund–the world’s biggest–signalled that it intends to sell some of its shares in oil and gas companies, dealing a symbolic blow to fossil fuels that will reverberate for energy companies and their investors.

“Now more than ever, unprecedented and urgent action is required by all nations” to reduce global warming, says UN Environment’s Emissions Gap Report 2018. “To bridge the 2030 emissions gap and ensure long-term decarbonization, countries must also enhance their mitigation ambitions,” it adds.

The International Resource Panel was launched by UN Environment in 2007 to build and share the knowledge needed to improve our use of resources worldwide. The Panel consists of eminent scientists, highly skilled in resource management issues from both developed and developing regions, civil society, industrial and international organizations.

UN Environment

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Green Planet

Why Climate Change Is Not a Hoax

Dr. Arshad M. Khan

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We humans are programmed to respond to dangers apparent and immediate, but the long term, the incipient, and to our eyes invisible elude us.  Climate change evidenced as global warming falls in this elusive category.  It is for this reason demagogues and fossil fuel interests can continue to deny or minimize the dangers so clearly presented in the latest Inter-Governmental Panel on Climate Change (IPCC) report released on October 8, 2018.

The articles in this handbook furnish conclusive evidence of climate change and its effects.  Unabated, it will devastate life on the planet.  As it is extreme weather events have worsened in intensity in recent years causing loss of life and billions of dollars in property damage.  Floods that happened once in a hundred years can be expected to occur once in 50 or 25 years.  Low-lying countries are already experiencing partial inundation through rising sea levels.  These could disappear completely. 

The principal greenhouse gas culprit, carbon dioxide (CO2), has reached record levels in the atmosphere exceeding 400 parts per million for the first time during the existence of modern man.  

What are we to do?  Well, the new IPCC report offers clues.  Its compromise of accepting a 1.5 degree Celsius rise in global mean temperature — somewhere between the 2C rise of the Paris agreement and the present rise above preindustrial levels — is exactly that … a compromise.  Severe weather consequences can still be expected to worsen. 

Logic then dictates the argument for the most interventionist scenarios where the atmospheric CO2 is eventually reduced.  To that end it is abundantly clear that we as individuals must continue to pressure our elected representatives to act, and to vote out those who persist in denial or inaction.

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