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More eco-friendly desalination

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There are about 16,000 operational desalination plants, located across 177 countries, which generate an estimated 25 billion gallons of fresh water daily.

For every gallon of drinking water produced at a typical desalination plant, one and a half gallons of brine are produced.  Much of it is stored in ponds until the water evaporates, leaving behind solid salt or concentrated brine for further treatment.  There are various other techniques for concentrating brines, but they are energy-intensive and environmentally problematic.  The process called electrodialysis uses electrified membranes to concentrate salts. 

Water flows into many channels separated by membranes, each of which has the opposite electrical charge of its neighbors.  Positive salt ions move towards negatively charged electrodes and negative ions move toward positive electrodes.  Two streams result, one containing purified water and one containing concentrated brine.

This eliminates the need for evaporation ponds, but existing electrodialysis membranes either result in leakage of salts into the environment or are too slow, making the process impractical for large-scale use.

Researchers at the University of Michigan have developed a new kind of membrane for electrodialysis.  The new membranes don’t leak and are ten times more conductive than those on the market today which means that they can move more salt using less power.  The membranes can be customized to suit a broad range of water types, which may help make desalination a more sustainable solution to the world’s growing water crisis.

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Making desalination more eco-friendly: New membranes could help eliminate brine waste

Photo, posted February 4, 2012, courtesy of David Martinez Vicente via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The human impact on biodiversity

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Biodiversity is under threat.  More and more plant and animal species are disappearing and humans are to blame.  Humans cause biodiversity loss through habitat destruction, invasive species, pollution, direct exploitation, and climate change, all of which are significantly influenced by human activities.

But until now, drawing broad conclusions about human impacts on biodiversity has been difficult because a clear, global overview of how human activity affects nature across all species did not exist. Most studies have focused on specific places, impacts, or time periods.

To fill these research gaps, a research team from the University of Zurich in Switzerland and the Swiss Federal Institute of Aquatic Science and Technology conducted an unprecedented synthesis study.  The researchers compiled data from around 2,100 studies that compared biodiversity at almost 50,000 sites affected by humans with similar places that hadn’t been affected by humans. 

The synthesis study, which was recently published in the journal Nature, found humans are having a highly detrimental impact on biodiversity worldwide.  In fact, not only is the number of species declining, but the composition of species communities is also changing.  On average, the number of species at impacted sites was almost 20% lower than at unaffected sites.

The study, which is one of the largest ever conducted on this topic, highlights the widespread negative impact of human activities on nature, and emphasizes the need to consider all forms of life when assessing biodiversity loss. 

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The Devastating Human Impact on Biodiversity

Photo, posted November 19, 2014, courtesy of Green Mountain Girls Farm via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Amphibians and climate change

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Amphibians are a group of vertebrate animals that include frogs, toads, and salamanders. They are unique for their ability to live both in water and on land during different stages of life. Amphibians play a crucial role in ecosystems, often serving as both predators and prey in food webs.

Amphibians are the world’s most at-risk vertebrates, with more than 40% of species listed as threatened.  They are cold-blooded creatures and rely on external sources to regulate their body temperature.  But needing to regulate their body heat this way makes amphibians particularly vulnerable to temperature change in their habitats. 

Researchers from the University of New South Wales in Australia can now predict the heat tolerance of 60% of the world’s amphibian species.  This new tool will allow scientists to better identify which amphibian species and habitats will be most impacted by climate change.  

The study’s landmark findings, which were recently published in the journal Nature, found that 2% of amphibian species are already exposed to overheating in shaded terrestrial conditions.  According to the research team, a 4°C global temperature increase could push 7.5% of amphibian species beyond their physiological limits. 

Local amphibian extinctions can trigger ecological repercussions, including reshuffling community compositions, eroding genetic diversity, and impacting the food chain and overall ecosystem health.

The researchers highlight the importance of vegetation and water bodies in protecting amphibians during heat waves, and emphasize the need to provide adequate water and shade during future conservation efforts. 

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The pot is already boiling for 2% of the world’s amphibians: new study

Photo, posted October 8, 2011, courtesy of Dave Huth via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

A record warm January

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Americans experienced unusually cold and wintery weather in January.  Places like southern Louisiana and Florida saw appreciable amounts of snow.  For those who experienced January’s Arctic blast, it was a cold January.  But despite that, January was the world’s warmest on record, extending a run of extraordinary heat in which 18 out of the last 19 months saw an average global temperature more than 1.5 degrees Celsius above pre-industrial times.  In fact, the global average temperature in January was 1.75 degrees above the pre-industrial average.

The exceptional warmth was surprising to climate researchers.  It happened despite the emergence of La Niña conditions in the Pacific Ocean, which tend to lower global temperatures, at least for a while.

Researchers are investigating whether there is something beyond the effects of greenhouse gas emissions that is boosting temperatures to an unexpected degree.  It is true that emissions, associated with the burning of coal, gas, and oil, reached record levels in both 2023 and 2024.  But January’s warmth was still something of a surprise.

One prevalent theory is that cutting dangerous pollution is playing a role in causing global warming to accelerate.  As regulators have curbed sulfate pollution to protect people’s lungs, the cooling effect of these particles that help form more and brighter clouds has diminished.

January demonstrates that the global climate system is complex and the weather in any particular region does not necessarily reflect what is happening to the planet as a whole.

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Global Temperatures Shattered Records in January

Photo, posted December 22, 2013, courtesy of SD Anderson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The warmest year on record

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It came as no surprise that 2024 ended up as the warmest year on records. It was the hottest year since record keeping began in 1880.  The global average temperature was 1.28 degrees Celsius (or 2.3 degrees Fahrenheit) above the 20th-century baseline period of 1951-1980.  It was actually 1.47 degrees above the 1850-1900 average.

The Paris Climate Agreement has a goal to keep the global average temperature increase below 1.5 degrees Celsius over the long term.  Long term is specified because for more than half of 2024, average temperatures were more than 1.5 degrees above the baseline.

The temperature of an individual year can be influenced by various natural climate fluctuations, such as the presence of an El Niño or a La Niña condition in the Pacific, or volcanic eruptions.  A strong El Niño began in 2023 and continued throughout much of 2024.  That El Niño has abated, so it is no longer a factor in the global climate condition.

The global temperature is determined using surface air temperature data collected from thousands of meteorological stations as well as sea surface temperature data collected by ships and buoy-based instruments. 

When the climate changes, it is observed first in the global mean temperature.  Then there are changes seen on a continental scale and then at the regional scale.  Finally, changes are observable at the local level.  These changes are becoming more and more common as people’s everyday weather experiences become different from any they had encountered before.

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2024 Was the Warmest Year on Record

Photo, posted August 26, 2015, courtesy of Saskia Madlener / NASA via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Unexplained heat wave hotspots

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2023 and 2024 have been the hottest years since records have been kept.  But above and beyond the upward march of average temperatures around the globe, there has been the phenomenon of distinct regions across the globe experiencing repeated heatwaves that are so extreme that they cannot be accounted for in any models of global warming.

A new study by Columbia University’s Climate School has provided the first worldwide map of such regions, which have emerged on every continent except Antarctica.  Heatwaves in these regions have killed thousands of people, withered crops and forests, and triggered devastating wildfires.

These recent regional-scale record-breaking temperature extremes have raised questions about whether current climate models can provide adequate estimates of the relationship between global mean temperature changes and regional climate risks.

Some of these regional events in recent years include a nine-day heatwave in the U.S. Pacific Northwest and southwestern Canada in June 2021 that broke daily records in some places by 54 degrees Fahrenheit.  Across Germany, France, the UK, the Netherlands, and other countries, the hottest days of the year are warming twice as fast as the summer mean temperatures. 

There is yet little understanding of the phenomenon.  Some theories related to destabilization of the jet stream don’t really explain all the temperature extremes observed.  But regardless of the underlying causes, the health impacts of these heat waves are severe, as are the effects on agriculture, vegetation, and infrastructure.  Society is not built to quickly adapt to them.

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Unexplained Heat Wave ‘Hotspots’ Are Popping Up Across the Globe

Photo, posted August 16, 2022, courtesy of Alisdare Hickson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Corals and climate change

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Climate change is a major threat to coral reefs around the world.  Ocean warming triggers coral bleaching – a stress response where corals expel the symbiotic algae essential for their survival.  If coral bleaching is severe, it can lead to coral death.

A new study led by scientists from Newcastle University in England suggests that corals are unlikely to adapt to ocean warming quickly enough to keep pace with global warming, unless there are rapid reductions in global greenhouse gas emissions.

The study, which was recently published in the journal Science, found that coral heat tolerance adaptation via natural selection could keep pace with ocean warming, but only if the climate goals of the Paris Agreement are realized.  In the Paris Agreement, countries agreed to limit global warming by the end of the century to two degrees Celsius above pre-industrial levels.  

However, current climate policies around the world have the globe on track to warm by three degrees Celsius.  According to the research team, this could lead to significant reductions in reef health, elevated risks of local coral extinctions, and considerable uncertainty in the so-called “evolvability” of corals. 

Coral reefs are among the most biologically diverse ecosystems on Earth.  They are often referred to as the “rainforests of the sea” because they support an incredible variety of marine life.  They provide essential ecosystem services, such as protecting coastlines from erosion and storm surges, supporting fisheries, and serving as a source of income through tourism. Coral reef health is vital for the health of the planet.

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Coral adaptation unlikely to keep pace with global warming

Photo, posted June 9, 2012, courtesy of Bokissa Private Island Resort via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The hottest day on record

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There have been numerous temperature records set in recent years.  Apart from record high temperatures for many places around the world, there were 13 consecutive monthly temperature records set for the planet since the previous summer.

According to NASA data, July 22, 2024, was the hottest day on record.  July 21st and 23rd also exceeded the previous daily record, which was set in July last year.  The new record was 17.16 degrees Celsius, or about 63 degrees Fahrenheit.

We are not used to thinking in terms of the global average temperature.  That is the number that keeps climbing and that climate goals seek to keep from getting too high.  The global average temperature is about 59 degrees Fahrenheit.  So, on July 22nd, the Earth was about 4 degrees warmer than usual.  That may not seem like much, but it takes an enormous amount of energy to raise the temperature of the planet by that amount.

The NASA report shows the global daily temperature throughout the year for the years 1980 to 2024.  It clearly shows how much warmer temperatures are now compared with the previous decades.

In many places, people experienced persistent hot weather during the month of July. New York’s Capital Region saw relentless hot and humid weather.  There were 9 days with high temperatures in the 90s.   July in Albany had a monthly mean temperature of 77.3 degrees, which was the highest in any current resident’s lifetime.  This is more than 4 degrees higher than the average over the past 30 years.  The last time the average temperature was over 77 was in 1887.  July was hot.

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NASA Data Shows July 22 Was Earth’s Hottest Day on Record

Photo, posted October 22, 2016, courtesy of Susanne Nilsson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Industrial agriculture and the risk of pandemics

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The domestication of pigs, cows, chickens, and other animals as livestock for their meat, milk, and eggs was historically revolutionary.  It boosted food security by giving people a readily-available means of feeding themselves as opposed to more traditional methods such as hunting and fishing.

But the industrialization of agriculture has led to horrendous conditions for animals.  Many are kept in huge quantities and packed together with little regard for their health and welfare.  This approach is designed to maximize production while minimizing costs.

With its chemical inputs and toxic outputs, intensive animal agriculture is also a major threat to the environment.  In fact, it’s a major driver of habitat degradation and biodiversity loss all around the globe.  

According to a new study led by researchers from the University of Exeter in the U.K., intensive livestock farming can also increase the risk of new pandemics.  These findings go against the widely held belief that industrialized farming reduces the risk of disease transmission between animals and humans. 

Zoonotic diseases are those that are spread from animals to humans.  According to the CDC, zoonotic infections account for three in every four new or emerging infectious diseases in humans.  The current bird flu outbreak in the U.S. is an example of this. 

In the paper, which was recently published in the journal Royal Society Open Science, the researchers conclude that the effects of intensifying animal agriculture “are at best uncertain and at worst may contribute to emerging infectious disease risk.”

Industrial animal agriculture is a threat to both human health and the health of our planet.

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Intensive farming could raise risk of new pandemics

Photo, posted January 29, 2016, courtesy of Farm Watch via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Nearly everyone wants climate action

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A global survey of 75,000 people revealed that 80% of participants want their governments’ climate action commitments to be stronger.  The poll, conducted by the United Nations Development Program, GeoPoll, and Oxford University, asked 15 questions in telephone calls to residents of 77 countries representing 87% of the global population.

According to the survey, 89% of poorer countries favored increasing efforts to curb global emission, while 76% of wealthy G20 nations supported tougher climate action.

The two biggest greenhouse emitters in the world were less enthusiastic:  Chinese participants were 73% in favor of stronger action and Americans were 66% in favor of greater efforts to combat global warming. 

Other demographic differences included that in the big emitting countries of Canada, France, Germany, Australia, and the U.S., women were 10 to 17% more in support of stronger climate action than men.

Overall, only 7% of those polled globally thought their government should not transition away from fossil fuels at all.  More than half of those polled said that they were more worried about climate change this year than last year.  A worldwide majority of 72% support a fast fossil fuel phaseout, including those in nations that are among the top ten coal, oil, and gas producers.

As is the case across the board with respect to climate issues, the more influential factor continues to be economic as opposed to scientific or humanitarian.  Those who stand to lose the most money from the transition away from fossil fuels continue to hold sway over those who will lose in many other ways.

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Four Out of Five People Want Increased Climate Action, UN Poll Says

Photo, posted July 31, 2020, courtesy of School Strike 4 Climate via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

A month of extra-hot days

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The past 12 months have been the hottest ever measured across the globe.  This may not be everyone’s experience in every location, but the average person on Earth experienced 26 more days of abnormally high temperatures than they would have in the absence of climate change.

Researchers considered a given day’s temperature to be abnormally high in a particular location if it exceeded 90% of the daily temperatures recorded there between 1991 and 2020.  Nearly 80% of the world’s population experienced at least 31 days of abnormal warmth since May of 2023.  Theoretically, the number of unusually warm days would have been far fewer in the absence of global warming.

In some countries, the extra-warm days added up to two or three weeks.  In others, such as Colombia, Indonesia, and Rwanda, there were up to 4 months of them. The average American experienced 39 days of extra-warm temperatures since last May.

Scientists also added up how many extreme heat waves the planet experienced since last May.  These are defined as episodes of unseasonable warmth across a large area, lasting three or more days, and causing significant loss of life or disruption to infrastructure or industry.  In total, the researchers identified 76 such episodes, affecting 90 countries, on every continent except Antarctica.

The world’s climate is now shifting toward the La Niña phase of the cyclical pattern called the El Niño-Southern Oscillation. This usually leads to cooler temperatures on average, but the recent heat could have lingering effects on weather and storms for months to come, including what is expected to be an extraordinarily active Atlantic hurricane season.

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Climate Change Added a Month’s Worth of Extra-Hot Days in Past Year

Photo, posted December 21, 2011, courtesy of Maggie Lin Photography via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Global groundwater depletion

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Groundwater is found underground in aquifers and it bubbles up naturally into springs, streams, and rivers.  It’s also often pumped out for use by people. 

Researchers from UC Santa Barbara have conducted the largest assessment of groundwater levels across the globe, spanning 170,000 wells and nearly 1,700 aquifers across more than 40 countries. The team compiled and analyzed data, including 300 million water level measurements taken over the past 100 years.

In the study, which was recently published in the journal Nature, the researchers found that groundwater is rapidly declining across the globe, often at accelerating rates.  In fact, they found that groundwater is dropping in 71% of the aquifers studied.  The rates of groundwater decline observed in the 1980s and ’90s sped up from 2000 to the present, highlighting how a bad problem became even worse. 

But there are some reasons to be optimistic.  That’s because in 16% of the aquifers studied, the researchers found that the rate at which groundwater levels are falling in the 21st century had slowed down compared to the 1980s and ‘90s.  The research team highlighted specific success stories in Thailand, Arizona, and New Mexico, where groundwater has begun to recover after interventions to better regulate water use or redirect water to replenish depleted aquifers.

While groundwater depletion isn’t inevitable, the researchers stress that aquifer recovery will require interventions.  They hope this study will help scientists, policy makers, and resource managers better understand the global dynamics of groundwater. 

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Global groundwater depletion is accelerating, but is not inevitable

Photo, posted October 4, 2016, courtesy of Deborah Lee Soltesz / Coconino National Forest via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Air pollution in India

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India is one of the world’s most polluted countries.  In fact, of the 30 cities with the worst air pollution around the globe, 21 of them can be found in India. 

India’s capital city, New Delhi, is the most polluted city in the world.  Concentrations of fine particulate matter (known as PM2.5) in Delhi, which is the name of the larger city that includes the capital New Delhi, are nearly 10 times greater than the World Health Organization guidelines. 

To reduce air pollution in Delhi, officials have focused on measures within the city limits, including boosting public transportation and regulating pollution from industry. 

But according to a review carried out by the University of Surrey and regional government officials in Delhi, the city will also need the help of its neighbors to tackle its killer smog problem.  Some of the pollution plaguing Delhi comes from rural areas in the region –  from things like crop burning, wood stoves, and power plants.  The review, which was part of a paper recently published in the journal Sustainable Horizons, also recommends drafting regional air quality plans, producing smog forecasts, and creating airshed councils to help improve coordination. 

Exposure to air pollution can cause all sorts of major health problems, including asthma, respiratory inflammation, as well as  jeopardize lung function, and even promote cancer.  Long-term exposure to PM2.5 is linked to premature death.  In fact, air pollution causes an estimated 670,000 deaths every year in India. 

Since air pollution doesn’t respect boundaries or borders, solutions require collaboration and the need to focus efforts more broadly in order to achieve emissions reduction goals. 

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Delhi smog: India’s cities must look beyond their limits to clean up air pollution

Photo, posted December 27, 2019, courtesy of Ninara via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The hottest year on record

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Barring some sort of massive global deep freeze late in the year, it was increasingly obvious by November that 2023 was going to be the hottest year ever recorded.  After analyzing data that showed the world saw its warmest ever November, experts around the world made the call early in December.

According to the European Union’s Copernicus Climate Change Service, from January to November 2023, global average temperatures were the highest on record – 1.46 degrees Celsius or 2.6 degrees Fahrenheit above the pre-industrial average.  Given that the Paris Climate Accord has the goal of keeping warming below 1.5 degrees Celsius, 2023 has been an alarmingly hot year.

November itself was 1.75 degrees warmer than the pre-industrial average.  The average surface air temperature for the planet was 14.22 degrees Celsius or about 57.6 degrees Fahrenheit.  Now 57 degrees doesn’t sound all that warm, but we are not accustomed to thinking in terms of the average temperature for the entire planet.  Keep in mind that the planetary average includes Antarctica and the polar north. The year as a whole had six record-breaking months and two record-breaking seasons. 

There is no reason to hope that the warming in 2023 was an anomalous occurrence and that 2024 is apt to be cooler.  With an El Niño in place in the Pacific, the new year might even be warmer than the previous one.  With continued warming, extreme weather events are likely to become even more frequent and intense, exacerbating the damage and loss of life from droughts, floods, hurricanes, and wildfires.

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2023 is officially the hottest year ever recorded, and scientists say “the temperature will keep rising”

Photo, posted June 7, 2012, courtesy of NASA/Kathryn Hansen via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Shrinking Glaciers And Methane | Earth Wise

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The Arctic region is warming much faster than the rest of the planet.  In fact, according to a study published last year in the journal Nature, the Arctic has been warming nearly four times faster than the rest of the globe during the last 43 years.  This rapid warming is leading to substantial reductions in sea ice, thawing of permafrost, shifts in wildlife populations, and changes in ocean circulation patterns, among other changes. 

According to new research recently published in the journal Nature Geoscience, shrinking glaciers in the warming Arctic are exposing bubbling groundwater springs, which could provide an underestimated source of methane, a potent greenhouse gas.  Methane is more than 25 times as potent as carbon dioxide at trapping heat in the atmosphere.

The study, which was led by researchers from the University of Cambridge and the University Centre in Svalbard, Norway, found large sources of methane gas leaking from groundwater springs unveiled by melting glaciers. 

As glaciers retreat in the Norwegian archipelago of Svalbard and leave behind newly exposed land, groundwater beneath the Earth seeps upward and forms springs. In 122 out of the 123 springs studied, the research team found that the water was highly concentrated with dissolved methane.  When the spring water reaches the surface, the excess methane can escape to the atmosphere. 

Researchers are concerned that additional methane emissions released by the Arctic thaw could dramatically increase human-induced global warming.  If this phenomenon in the Svalbard archipelago is found to be more widespread across the Arctic — where temperatures are quickly rising and glaciers melting — the methane emissions could have global implications. 

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The Arctic has warmed nearly four times faster than the globe since 1979

Shrinking Arctic glaciers are unearthing a new source of methane

Photo, posted October 22, 2022, courtesy of David Stanley via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

El Niño Will Likely Return | Earth Wise

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El Niño, a weather phenomenon triggered by warm waters in the eastern Pacific, is likely to return this year, according to the World Meteorological Organization.  The Pacific has been in the cooler La Niña phase for the past 3 years, which is unusual, but that appears to be coming to a close.  According to the WMO, there is an 80% chance that the Pacific will shift to the El Niño phase before fall.

Record hot years typically coincide with El Niño, which adds to the ongoing warming trend in the climate.   There is not yet a clear picture of how strong the forthcoming El Niño event will be or how long it might last, but even a mild El Niño could affect precipitation and temperature patterns around the world.

The hottest year on record, 2016, occurred during a particularly strong El Niño.  Experts expect that 2024 is likely to see soaring temperatures again.  El Niño generally leads to drier conditions in Australia, Indonesia, and southern Asia, but greater amounts of rainfall in South America, the U.S., and parts of Africa.  Despite the presence of a cooling La Niña for the past three years, the last eight years have been the hottest on record.

El Niño and La Niña form an intermittent cycle known as the El Niño Southern Oscillation, or ENSO, that is highly influential in shaping the year-to-year variations in weather conditions around the world.  ENSO is a natural phenomenon and scientists are still trying to understand how human-caused climate change might be impacting the behavior and dynamics of the cycle.

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‘A New Spike’ in Global Temperatures in the Forecast

Photo, posted October 11, 2015, courtesy of Harshil Shah via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Vanishing Arctic Lakes | Earth Wise

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In recent decades, the warming in the Arctic has been much faster than in the rest of the world.  The phenomenon is known as Arctic amplification.  A study by the Finnish Meteorological Institute published in August in Communications Earth & Environment determined that during the past 43 years, the Arctic has been warming nearly four times faster than the rest of the globe.  The result of this amplified warming has been that glaciers are collapsing, wildlife is struggling, and habitats continue to disappear at a record pace.

Research published by the University of Florida has identified a new threat associated with Arctic amplification: lakes in the Arctic are drying up.

Over the past 20 years, many Arctic lakes have shrunk or dried up completely across the entire pan-Arctic region, which spans the northern parts of Canada, Russia, Greenland, Scandinavia, and Alaska.

Arctic lakes are essential elements of the Arctic ecosystem and for the indigenous communities that live in the region.  They provide a critical source of fresh water for those communities and local industries. 

The rapid decline of Arctic lakes is unexpected.  Earlier predictions were that climate change would first actually expand lakes in the region as ground ice melted.  Lakes drying out was not expected until much later in this century or even in the 22nd century.  Instead, it appears that thawing permafrost may drain lakes and overwhelm the expansion effect caused by melting ice.  The theory is that thawing permafrost decreases lake area by creating drainage channels and increasing soil erosion.

The finding suggest that permafrost thawing is occurring faster than anticipated, which presents many additional problems.

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As the climate crisis intensifies, lakes across the Arctic are vanishing

Photo, posted June 20, 2014, courtesy of Bob Wick / Bureau of Land Management via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Propane Refrigerants | Earth Wise

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About 10% of the world’s total electricity supply is used for air conditioning.  If current temperature trends continue, the energy demands for space cooling will more than triple by the year 2050.  Air conditioning is a double threat to the environment.  Apart from using lots of energy, ACs also make use of halogenated refrigerants that are extremely powerful greenhouse gases.

The most common space cooling appliances are split-air conditioners, which use an indoor unit and an outdoor unit connected by pipes.  These split ACS mostly utilize HCFC-22 and HFC-410 as refrigerants, which have global warming potential scores as high as 2,256 – meaning they trap 2,256 times more heat than carbon dioxide. 

A study by the International Institute of Applied Systems Analysis in Austria has shown that propane is a far better choice as an air conditioning refrigerant.  Its global warming potential is actually less than 1 meaning it traps less heat than carbon dioxide.  According to the study, if air conditioners switched to propane refrigerants, the world would avoid about a tenth of a degree Celsius of additional warming, which is a significant contribution to meeting the goals of the Paris climate agreement.

Propane-based split-ACs are already available commercially in China and India.  Elsewhere, many national regulations prohibit their use, primarily due to codes restricting the use of refrigerants with higher flammability.  Given the increasingly urgent need for climate action, it seems to be time to reconsider regulations on refrigerants.

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Propane — a solution for more sustainable air conditioning

Photo, posted March 24, 2021, courtesy of Phyxter Home Services via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Phasing Out Disposables | Earth Wise      

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Humans generate a remarkable amount of garbage.  According to the World Bank, humans produce 4.5 trillion pounds of trash every year, with at least 33% of this garbage not managed in an environmentally-safe manner. By 2050, global garbage generation is expected to reach nearly 7.5 trillion pounds a year. 

Globally, an average of 1.6 lbs of waste is generated per person per day.  While high-income countries only account for 16% of the global population, they are responsible for about 34% of the world’s waste. 

But almost everything humans throw away was bought from a company.   Whether it was the packaging or the product itself, we purchased it from somewhere.  There’s a growing movement to hold the companies responsible for the trash they produce. 

Faced with increasing consumer consciousness, many companies are stepping up and announcing initiatives to reduce their waste.  Starbucks is one of them.  The company’s white logo-emblazoned paper cups and clear plastic cups are instantly recognizable symbols of the brand.  But these ubiquitous cups are disposable and also serve as a symbol of our throwaway society. 

By the end of next year, Starbucks is planning to allow customers to use their own personal mugs at every location in the U.S. and Canada.  By 2025, the company wants every customer to be able to use either their own mug or to borrow a ceramic or reusable to-go mug.  This borrow-a-mug program is currently being tested in eight different markets around the globe. 

In lieu of regulation mandating corporate responsibility for waste, we will have to hope that more companies do the right thing.

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Starbucks is planning to phase out its iconic cups

Photo, posted June 11, 2010, courtesy of Sunghwan Yoon via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Tree Diversity | Earth Wise

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Scientists have estimated that there are more than 8 million species of plants and animals in existence.  Amazingly, only about 1.2 million of them have been identified and described so far and most of those are actually insects.  Millions of other organisms have yet to be discovered.

One would imagine that most of these unknown species are tiny things that are hard to spot or encounter.  But our ignorance of species even applies to trees, which are pretty easy to spot if you encounter them.

A new study involving more than 100 scientists across the globe has produced an estimate of the number of tree species on the Earth.  The new global estimate is that there are 73,000 tree species, which is about 14% more than previously thought.  Based on a combination of data from two global datasets, the study yielded a total of 64,100 documented tree species worldwide.  The researchers then used novel statistical methods to estimate the total number of unique tree species at biome, continental, and global scales, which includes species yet to be discovered and described by scientists.  Therefore, the estimate predicts that there are likely to be over 9,000 tree species still to be found.

Roughly 40% of the undiscovered tree species are likely to be in South America, which is the continent with the highest number of rare tree species and the highest number of continentally endemic tree species – meaning those found only on that continent.  Hot spots of undiscovered tree species are likely the tropical and subtropical moist forests of the Amazon basin and the Andes-Amazon interface.

Extensive knowledge of tree richness and diversity is key to preserving the stability and functioning of ecosystems.

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Number of Earth’s tree species estimated to be 14% higher than currently known, with some 9,200 species yet to be discovered

Photo, posted November 5, 2017, courtesy of Deensel via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

WAMC Northeast Public Radio

WAMC/Northeast Public Radio is a regional public radio network serving parts of seven northeastern states (more...)