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Extreme heat and dairy production

May 6, 2025 By EarthWise Leave a Comment

Climate change is causing more frequent and intense heat waves in the United States. Studies show that not only are heat waves now occurring more often, but that the average heat wave season is nearly 50 days longer now than it was in the 1960s.  The overall rise in temperatures, linked to climate change, has led to increased health risks and fatalities from extreme heat. 

As humans face increasing health risks from this extreme heat, livestock are also suffering from the effects of rising temperatures.  Extreme heat negatively impacts dairy production by causing heat stress in cows, which can reduce milk yield, quality, and the cows’ overall health.

A new study by researchers from the University of Illinois Urbana-Champaign analyzed milk production data from 18,000 dairy farms across nine Midwest states between 2012 and 2016.  The researchers found that high heat and humidity have led to a 1% decline in annual milk yield. While this might not sound like a lot, it amounts to about 1.4 billion pounds of milk over five years from the 18,000 herds included in the study – equivalent to about $245 million in lost revenue.

The study, which was recently published in the journal Food Policy, found that small farms are hit harder than large farms.  Larger farms may be able to mitigate some of the effects through management strategies, such as open barn sides, fans, and sprinklers.

Using projections from 22 different climate models, the research team estimates that more frequent extreme heat will increase milk yield losses by about 30% by 2050. 

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Illinois study: Extreme heat impacts dairy production, small farms most vulnerable

Photo, posted March 13, 2018, courtesy of Gosdin via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Fighting harmful algal blooms with harmful algal blooms

March 7, 2025 By EarthWise Leave a Comment

Fighting harmful algal blooms using harmful algal blooms

Harmful algal blooms – HABs – occur when colonies of algae grow out of control and produce toxic or harmful effects on people, marine life, and birds.  HABs occur naturally but their frequency and intensity are often associated with increased nutrient loading (mainly phosphorous and nitrogen) in bodies of water that is the result of runoff from sources like lawncare and agriculture.

Researchers at Florida Atlantic University have developed a technique for transforming cyanobacteria – also known as blue-green algae and a prime HAB material – into an effective material for removing phosphorous from water.

Their process converts blue-green algal biomass – essentially hazardous waste – into a custom-made adsorbent material that can pull harmful phosphorous from water.  The algae is first quickly heated up using microwaves and then it is modified by adding lanthanum chloride. 

The study took blue-green algae from Florida’s Lake Okeechobee, synthesized the adsorbent material in minutes, and using only small amounts of it could remove 90% of the phosphorous present in only half an hour.  It worked perfectly well in the presence of natural organic matter.  Using the harmful algae itself to prevent algal growth in bodies of water is an innovative way to reduce its further occurrence.

Phosphorous is a major contributor to the occurrence of harmful algal blooms, which can lead to toxic water conditions, loss of aquatic life, and significant economic losses for the fishing and tourism industries.  This technique could prove to be an essential tool for managing the growing problem of nutrient pollution.

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FAU Engineering Develops New Weapon Against Harmful Algal Blooms

Photo, posted October 27, 2010, courtesy of Jennifer L. Graham / U.S. Geological Survey via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Reducing farm nutrient pollution

December 11, 2024 By EarthWise Leave a Comment

Researchers developing new method to reduce nutrient pollution from farms

When farmers add nutrients to their fields in excess of their crops’ ability to utilize them, these excess nutrients can enter the surrounding environments and create environmental problems.  The primary culprits are nitrogen and phosphorous.  These fertilizer components emerge from fields and enter local waterways in surface runoff.

Researchers at the University of Illinois Urbana-Champaign have developed a form of designer biochar that can provide phosphorous in a time-released fashion and reduce the amount that escapes into the environment.

The researchers used sawdust and lime sludge, which are byproducts from milling and water treatment plants, respectively.  They mixed the two ingredients and formed pellets which were then slow-burned in low-oxygen conditions to create phosphorous-laden designer biochar.  Once the pellets bind all the phosphorous they can hold, they can be spread onto fields where the nutrient is slowly released over time.

They tested the pellets in working field conditions.  The pellets are used to remove phosphorous from drainage water and then can be reused in the field to provide the nutrient to the plants.   

The results were very encouraging.  The biochar proved to be a very effective way to provide phosphorous to crops and then reduce how much phosphorous enters the environment.  The cost of producing the biochar pellets was less than half that of alternative substances for phosphorous removal. 

There is currently no regulation that requires farmers to remove phosphorous from drainage water but there are a growing number of conservation-minded farmers who want to reduce nitrogen and phosphorous losses from their fields.  The idea that the recyclable pellets can both provide and control phosphorous is an attractive one.

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Scientists tackle farm nutrient pollution with sustainable, affordable designer biochar pellets

Photo, posted July 16, 2016, courtesy of Rick Obst via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Megafires and orchard health

November 1, 2024 By EarthWise Leave a Comment

The frequent and massive megafires in places like Canada and the American west have led to a lot of research on the impact of smoke on humans but there has been less study of the effects of smoke on plant health.  Researchers at the University of California, Davis have found that trees are just as vulnerable as humans are to the harmful effects of long-term exposure to smoke.

The Davis researchers studied almond, pistachio, and walnut trees at 467 orchard sites in California’s Central Valley from 2018 to 2022.  In 2022, so-called megafires burned more than 4.2 million acres in California, pouring ash and smoke into the sky.  The researchers had been studying how trees store carbohydrates to cope with heat and drought. 

With the onset of the fires, they saw an opportunity to study how smoke affects carbohydrate levels.  Trees use stored carbohydrates to sustain them through winter dormancy and spring growth.  Trees produce carbohydrates via photosynthesis and thick smoke blocks the amount of light reaching the trees.  Beyond that, there are other aspects of wildfire smoke, such as particulate matter and ozone that appear to affect photosynthesis.

The team found that the smoke not only reduced the amount of carbohydrates in trees but also caused losses that continued even after the fires were extinguished.  This led to nut yield decreases of 15% up to 50% in some orchards.  The researchers expected to see some impact on the trees during periods when smoke was really dense but were not expecting the smoke to have such a lingering effect and result in a significant drop in yield.

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Smoke From Megafires Puts Orchard Trees at Risk

Photo, posted October 1, 2008, courtesy of Suzi Rosenberg via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The slippery slopes of the ski industry

July 18, 2024 By EarthWise Leave a Comment

According to the National Oceanic and Atmospheric Administration, snowfall is declining globally as temperatures warm because of human-caused climate change.  Less snow threatens to reinforce global warming, and to disrupt food, water, and livelihoods for billions of people.   

According to new modeling by researchers from Protect Our Winters Australia and The Australian National University, the ski industry in Australia is at risk of major disruptions and shorter seasons if climate change continues unabated.  The researchers found the average ski season across all resorts in Australia will be 44 days shorter by 2050 under a mid-greenhouse gas emissions scenario, and 55 days shorter under a high-emissions scenario.

But the research team also revealed that the Australian ski industry would fare significantly better if decisive action is taken to reduce climate pollution.  In fact, under a low-emissions scenario, the ski season would be 28 days shorter by 2050, before starting to improve by 2080 if emissions are kept down.

However, if decisive climate action isn’t taken, the researchers warn some ski resorts in Australia may be forced to close for good.  But this threat isn’t unique to Australia. 

In fact, according to a study recently published in the journal PLOS ONE, 13% of ski areas around the world are predicted to lose all natural snow cover under the high-emissions scenario by 2071-2100 – relative to their historic baselines. 

The future losses of ski areas around the world will be significant if global emissions continue unchecked.

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Climate crisis puts Australia’s ski industry on slippery slope, but not all hope is lost

“Our Changing Snowscapes” Report Released

The future is likely less skiable, thanks to climate change

Photo, posted June 6, 2018, courtesy of Clement Tang via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The global chocolate supply is threatened

May 16, 2024 By EarthWise Leave a Comment

The global supply of chocolate is threatened

The world is facing the biggest deficit of cocoa in decades. Most cocoa beans are grown in West Africa, where climate change-induced drought has ravaged crops.  Harvests are forecasted to fall short for the third consecutive year. 

The harvest shortfall has triggered a steep rise in cocoa prices.  In fact, cocoa prices have more than doubled in the first four months of this year, and have more than tripled in the past 12 months.

But drought isn’t the only threat:  A rapidly spreading virus is also threatening the future of chocolate.   

Approximately half of the world’s chocolate originates from cacao trees in Ghana and the Ivory Coast.  The Cacao Swollen Shoot Virus Disease is spread by small insects called mealybugs, which eat the leaves, buds, and flowers of cacao trees.  The virus is attacking cacao trees in Ghana, resulting in harvest losses of 15-50%. 

Pesticides don’t work well against mealybugs.  Farmers can vaccinate trees to inoculate them from the virus.  But the vaccines are expensive, and the vaccinated trees produce a smaller harvest of cacao.

According to a new paper recently published in the journal PLOS ONE, an international team of researchers has developed a new strategy to combat these pests: using mathematical data to determine how far apart vaccinated trees need to be planted in order to stop mealybugs from hopping from tree to tree.  The researchers developed two models that allow farmers to create a defensive ring of vaccinated trees around unvaccinated trees

The research team hopes its models will help farmers protect their crops and achieve better harvests in the future. 

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Cacao sustainability: The case of cacao swollen-shoot virus co-infection

Will rising cocoa prices trigger a chocolate crisis?

Photo, posted April 1, 2019, courtesy of Konrad Lembcke via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Major species turnover forecasted for North American cities

May 2, 2024 By EarthWise Leave a Comment

Major species turnover is forecasted for cities in North America

Climate change affects animal species in many ways.  It induces habitat loss, disrupts migration and breeding patterns, threatens marine life, and facilitates an increased spread of disease.  It may also affect where animals can be found in the future. 

According to a new study led by researchers from the University of Toronto Mississauga and Apex Resource Management Solutions in Canada, climate change may dramatically affect the animal species observed in North American cities by the end of the century.

The researchers used species distribution data combined with machine learning to study the impact of human-caused climate change on more than 2,000 animal species historically found in the 60 most populous North American cities. 

According to the research team, changes in biodiversity are brewing for almost every city it studied by the year 2100.  In fact, cities with a rich history of biodiversity are predicted to have the largest declines and fewest gains in species. Cooler and wetter cities like Quebec, Ottawa, Winnipeg, Kansas City, and Omaha are expected to welcome the most new species.  Warmer cities with higher precipitation – like cities in coastal California – are projected to lose the most species. 

More than 95% of bird and insect species are predicted to experience a change in the number of cities they call home.  Canines, most amphibians, and aquatic birds are expected to experience the greatest losses.  Toads, turtles, mice and pelicans are projected to become more common overall. 

The researchers hope their findings will encourage more efforts to protect biodiversity.

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North American cities may see a major species turnover by the end of the century

Photo, posted September 29, 2013, courtesy of Jonathan Kriz via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Skiing and climate change

April 12, 2024 By EarthWise Leave a Comment

Climate change threatens the future of skiing

According to the National Oceanic and Atmospheric Administration, anthropogenic climate change resulting in higher average temperatures has caused a global decline in snowfall.  Less snow threatens to reinforce global warming, and to disrupt food, water, and livelihoods for billions of people.  

According to a new study recently published in the journal PLOS ONE, annual snow cover days in all major skiing regions are projected to decrease dramatically as a result of climate change.  In the study, the research team from the University of Bayreuth in Germany examined the impact of climate change on annual natural snow cover in seven major skiing regions.  Using the public climate database CHELSA, the researchers predicted annual snow cover days for each ski area for 2011-2040, 2041-2070, and 2071-2100 under low, high, and very high carbon emissions scenarios.

Under the high emissions scenario, 13% of ski areas are predicted to lose all natural snow cover by 2071-2100 relative to their historic baselines.  By 2071-2100, average annual snow cover days were predicted to decline by 78% in the Australian Alps, 51% in the Southern Alps, 50% in the Japanese Alps, 43% in the Andes, 42% in the European Alps, 37% in the Appalachians, and 23% in the the Rocky Mountains – all declines relative to their historic baselines.

The future losses of natural snow cover in ski areas around the world will be significant if global emissions continue unchecked.

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The future is likely less skiable, thanks to climate change

New maps show where snowfall is disappearing

Photo, posted April 14, 2006, courtesy of Kallu via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Protecting wine grapes from wildfire smoke

February 27, 2024 By EarthWise Leave a Comment

In recent years, wildfires have become a major threat to the wine industry because of the effects of smoke on wine grapes.  Smoke taint from the California fires of September 2020 significantly impacted the quality of wine grapes.  In total, smoke taint cost the wine industry in Western states more than $3 billion in losses from the hundreds of thousands of tons of wine grapes that could not be harvested because of the off flavors imparted by the smoke.  The California wine industry alone is a $43 billion a year business and the state’s frequent wildfires are a major threat to it.

Researchers at Oregon State University have developed techniques for eliminating the effects of three volatile chemical compounds that contribute to smoke taint in grapes.  The compounds are guaicol, syringol, and meta-cresol.

The researchers developed cellulose nanofiber-based coatings that can be applied to grapes in the vineyard.  The coatings can block guaicol and syringol and capture meta-cresol.

Blocking is ideal because the coating doesn’t absorb the wildfire smoke compounds.  Therefore, it doesn’t have to be washed off.  Capturing means the coating absorbs the compounds and would need to be washed off.  Ideally, a coating that doesn’t need to be washed off would save time, money, and water.

Two years of studies at Oregon State found that the coatings do not impact the growth and quality of wine grapes.  In an era when wildfires are increasingly common and extensive, growers need something they can spray on their vines to protect their grapes.  If the Oregon State technology can be commercialized, it would be a game-changer for the Western U.S. wine industry.

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Spray coating for grapes shows promise in battle between wildfire smoke and wine

Photo, posted October 3, 2006, courtesy of Naotake Murayama via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Better Plastic Recycling | Earth Wise

September 14, 2023 By EarthWise Leave a Comment

Developing a better way to recycle plastics

Many of us are careful to put our plastic trash into the appropriate recycling bins hoping that we are helping to stem the global tide of plastic waste.  But many plastics are not recyclable at all and recycling those that are is not even always a good thing.  Breaking down plastics can generate polluting microplastics that are themselves a major environmental problem.  And perhaps the biggest problem for recycling efforts is that they are not cost effective and generally incur huge losses.

Chemical engineers at the University of Wisconsin-Madison recently published a study in the journal Nature outlining a new technique for turning low-value waste plastic into high-value industrial chemicals. 

The technique makes use of two existing chemical processing techniques.  The first is pyrolysis, which is high-temperature heating in an oxygen-free environment.  Heating waste plastic in this way produces pyrolysis oil, a liquid mix of various compounds that includes large amounts of olefins.  Olefins are simple hydrocarbons that are a central building block of many chemicals and polymers.  Olefins are most often produced by energy-intensive processes like steam cracking of petroleum. 

The UW-Madison process takes the olefins and subjects them to a process called homogenous hydroformylation catalysis, which converts them into aldehydes, which can then be further reduced into important industrial chemicals. 

The payoff is that the process can take waste plastics, which are only worth about $100 a ton, and turn them into high-value chemicals worth $1,200-$6,000 a ton.  If the process can be optimized and otherwise made ready for industrial-scale use, it would be a real game-changer in the battle against plastic waste.

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New recycling process could find markets for ‘junk’ plastic waste

Photo, posted September 16, 2015, courtesy of Oregon State University via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Marine Heatwaves And Fish | Earth Wise

November 4, 2021 By EarthWise Leave a Comment

Extremely hot years will hurt fishing revenues and cost jobs

Marine heatwaves are periods of abnormally high temperatures in the ocean that can trigger devastating impacts on ecosystems, including coral bleaching, toxic algal blooms, and mass mortality events.  Marine heatwaves can occur in any ocean and in any season.  They are defined based on the differences between actual and expected temperatures for the location and time of year.     

According to several studies, even under moderate climate warming scenarios, oceans will experience more frequent and longer-lasting marine heatwaves in the years to come.

Researchers from the University of British Columbia’s Institute for the Oceans and Fisheries in Canada have found that extremely hot years will wipe out hundreds of thousands of tons of fish globally this century.  These losses are in addition to the projected decreases to fish stocks from long-term climate change. 

Under a worst-case scenario where no action is taken to curb greenhouse gas emissions, the research team’s model predicts a 6% drop in the amount of potential catches per year.  In addition, the biomass (or amount of fish by weight) is projected to decrease in 77% of exploited species due to the extreme temperatures.

As a result of climate change and these extreme heat events, the research team projected that fisheries’ revenues would decrease by an average of 3% globally, and employment would fall by 2% globally – a loss of likely millions of jobs.

The research team says active fisheries management is critical.  Catch quotas, for example, need to be adjusted in years when fish stocks are suffering from marine heat events.  In severe cases, the fisheries may need to be shuttered in order to allow fish stocks to rebuild.  

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Fevers are plaguing the oceans — and climate change is making them worse

Marine heatwaves could wipe out an extra six per cent of a country’s fish catches, costing millions their jobs

Photo, posted October 11, 2016, courtesy of Kahunapule Michael Johnson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

More Extreme Weather | Earth Wise

November 23, 2020 By EarthWise Leave a Comment

the costs of extreme weather

If it seems like natural disasters happen more frequently than they used to, that is because they do.  A new report from the United Nations entitled “The Human Cost of Disasters 2000-2019” provides the facts.  From 2000 to 2019, there were 7,348 natural disasters around the world, compared with 4,212 natural disasters from 1980-1999. 

The culprit is the climate.  Climate-related disasters increased from 3,556 events during the 1980-1999 period to 6,681 in the past 20 years, again an increase of more than 3,000.

The global economic losses associated with natural disasters have been staggering.  The earlier 20-year period saw $1.63 trillion in losses while the recent period resulted in $2.97 trillion in losses.   Disasters killed 1.19 million people in the earlier period and 1.23 million in the recent period.  It is a testimonial to the skills and efforts of disaster management agencies, civil protection departments, fire brigades, public health authorities, the Red Cross and Red Crescent, and many NGOs that the cost in human lives was not much greater over the past 20 years.

According to a statement from the UN, human society is being willfully destructive.  They draw that conclusion in light of reviewing the disaster events over the past 20 years and seeing the failure of society to act on science and early warnings to invest in prevention, climate change adaptation, and disaster risk reduction.  

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Extreme Weather Events Have Increased Significantly in the Last 20 Years

Photo, posted September 18, 2020, courtesy of the National Guard via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

How To Bend The Curve On Biodiversity Loss | Earth Wise

October 15, 2020 By EarthWise Leave a Comment

how to bend the curve on biodiversity loss

Biodiversity has been declining at an alarming rate in recent years as a result of human activities, including land use changes, pollution, and climate change.  According to a 2019 UN report, one million species – out of an estimated eight million – are threatened with extinction.  Many scientists warn we are in the middle of the sixth mass extinction event in Earth’s history.  Previous mass extinction events wiped out up to 95% of all species and took ecosystems millions of years to recover. 

Fortunately, new research indicates that it might not be too late to bend the curve on biodiversity loss.  According to the report, which was recently published in the journal Nature, more ambitious conservation measures are needed in order to  preserve biodiversity.  In addition, more efficient food production and healthier and less wasteful consumption and trade are needed to bend the curve. 

If these measures are undertaken with unprecedented ambition and coordination, the research team says the efforts will provide an opportunity to reverse biodiversity loss by 2050.

But even under the best case scenario, ongoing land conversion will lead to further biodiversity losses before the curve starts to bend.  In fact, at least one third of projected losses in the coming years are unlikely to be avoided under any scenario.  Biodiversity losses were projected to be highest in the regions richest in biodiversity, including South Asia, Southeast Asia, Sub-Saharan Africa, the Caribbean, and Latin America. 

The study, which was led by the International Institute for Applied Systems Analysis in Austria, makes it clear that urgent action is needed this decade in order to have any chance of bending the curve. 

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Curbing land clearing for food production is vital to reverse biodiversity declines

Photo, posted November 1, 2017, courtesy of Rod Waddington via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

A New Problem For New York Apples | Earth Wise

August 6, 2020 By EarthWise Leave a Comment

new york apples in trouble

New York is the second largest apple-producing state in the country, trailing only Washington state.  New York averages nearly 30 million bushels of apples annually from approximately 600 commercial growers.  The apple industry supports 10,000 direct agricultural jobs as well as 7,500 indirect jobs involved with fruit handling, distribution, marketing and exporting.

Thus, there is considerable concern about the recent discovery by Cornell plant pathologists of a new fungal pathogen that causes bitter rot disease in apples.  They also found a second related fungus that is known to cause rot disease in other fruits but has now been found for the first time in apples.  The study was published in early July in the journal Scientific Reports.

Both of these pathogens belong to the genus Colletotichrum, which contains 189 species of fungi that cause devastating rot diseases in multiple fruit crops, including bananas, strawberries, citrus, avocados, papayas, mangoes and apples.

Unless protective measures are taken in a timely manner, apple losses from bitter rot in New York state can average up to 25% per year.  Some organic farms have lost essentially all of their crop at times.  Bitter rot also can destroy up to 5% of marketable fruit in post-harvest storage.

The Cornell study of samples from eight New York counties found both the Colletotrichum chrysophilum fungus, that had not been found in apples before, and a newly-discovered fungus that they named Colletotrichum noveboracense, after the Latin name for New York State.

The researchers plan to work with other plant pathologists and apple breeders to identify possible genes that confer natural resistance to Colletotrichum fungi that can be bred into apple cultivars.

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Scientists identify new pathogen in NY apples

Photo, posted October 12, 2018, courtesy of Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

A Disastrous Year

February 5, 2019 By EarthWise Leave a Comment

The number and economic impact of natural disasters around the world have increased dramatically over the past 30 years.  In dollar terms, the amount has actually more than doubled.  While 2017 and especially 2011 hold the records for worldwide economic damage, 2018 was pretty disastrous in its own right, totaling at least $160 billion.

The year was dominated by costly wildfires in California and tropical storms in the United States and Asia.   According to a recent report by the reinsurance company Munich Re, the Camp and Woolsey fires in California alone caused losses of $21.7 billion, $16.5 billion of which was insured.

Overall, insurance companies paid out $80 billion in damage claims from natural disasters last year.  This was less than the $140 billion in 2017 but is still double the 30-year average.

Losses from wildfires have increased dramatically in recent years and summers continue to get hotter and dryer, a likely consequence of climate change.  These mounting costs bring into question whether people can continue to build in high-risk wildfire areas without dramatic changes in materials and the aggressive use of other protective measures.

Twenty-nine natural disaster events in 2018 caused more than a billion dollars in damage each.  Tropical storms including hurricanes Michael and Florence in the United States and three Asian typhoons caused $57 billion in damage.

A severe drought in Europe that set off major wildfires and caused agricultural losses caused $3.9 billion in losses.  Only about $280 million of this damage was covered by insurance companies since farmers in Europe don’t typically purchase insurance against drought.  For them, 2018 was truly a disastrous year.

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Natural Disasters Caused $160 Billion in Damage in 2018

Photo, posted July 26, 2018, courtesy of Bureau of Land Management California via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Elephant Losses Imperil Forests

April 20, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/04/EW-04-20-18-Elephant-Losses-Imperil-Forests.mp3

Poaching and habitat loss have reduced Central African elephant populations by 63% since 2001.  These losses not only pose dire consequences for the elephants themselves but also for the forests in which they live.

[Read more…] about Elephant Losses Imperil Forests

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