spring

Saving birds from buildings

July 1, 2025 By EarthWise Leave a Comment

Researchers estimate that hundreds of millions of birds die hitting buildings every year in the United States. Striking buildings is believed to be one of the major factors behind the nearly 30% decline in North American bird populations since 1970.

Chicago is one of the most dangerous cities for migrating birds based on its location and its numerous tall, glassy buildings. Migrating birds that make their homes in forests and grasslands don’t perceive glass as solid and are confused by reflections.

While many Chicago skyscrapers are dangerous for birds, the Lakeside Center at McCormick Place is infamous for the fact that it claimed the lives of nearly a thousand birds on a single day in October 2023.

There are various strategies for reducing bird strikes. Over decades, McCormick Place management has tried erecting strips of netting, broadcasting calls of birds of prey, and putting up silhouettes of them. They commissioned a nine-acre park of native prairie and woodlands on the roof of a parking deck. None of these things made a major difference.

Last summer, the building installed a pattern of dots over the surface of the building’s windows. The dots are only a couple of inches apart, so even tiny hummingbirds don’t try to dart through. The window treatment cost $1.2 million paid for by the state of Illinois. People in the building scarcely notice the dots. Their views of the city and lake are unimpaired.

The results are nothing short of remarkable. During last fall’s migration, bird deaths were down by about 95% compared with the two previous autumns. This spring’s migration has been with implications for glassy structures far beyond Chicago.

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An Illinois Building Was a Bird Killer. A Simple Change Made a World of Difference.

Photo, posted May 19, 2023, courtesy of Warren LeMay via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Climate risks for apple-growing areas

January 31, 2025 By EarthWise 2 Comments

The changing climate is creating challenges for some of the most productive apple growing regions in America. A study by Washington State University analyzed over 40 years of climate conditions that impact the growth cycle of apple trees.

Many growing areas face increased climate risk, but the top three apple-producing counties are among the most impacted. Yakima County in Washington is the country’s largest apple producer with more than 48,000 acres of apple orchards. Kent County in Michigan and Wayne County in New York (located east of Rochester) are the next two largest.

The study looked at six metrics that affect apple production. Two of these metrics relate to extremes: extreme heat days (with temperatures above 93 degrees) that can cause multiple problems and warm nights (with minimum temperatures above 59 degrees) that adversely affect coloration.

Other metrics included the number of cold days, the last day of spring frost, and the number of growing degree days, which are the number of days above a certain temperature that are conducive for apples to grow.

Changes to these metrics can impact apple production, change the time when apple flowers bloom, increase risk of sunburn on apples, and affect apple appearance and quality. In many places, nearly all of these metrics are changing in an undesirable direction.

Apples are the most consumed fruit in the United States. 27,000 American producers supply an industry with a downstream value of $23 billion. Apples are a big deal.

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Prime apple-growing areas in US face increasing climate risks

Photo, posted August 8, 2020, courtesy of Sue Thompson 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

Canadian zombie fires

April 8, 2024 By EarthWise Leave a Comment

Canada’s 2023 wildfire season was the most destructive ever recorded. Over 6,000 fires burned nearly 71,000 square miles of land from the West Coast to the Atlantic provinces. The burned areas are roughly the size of the entire country of Finland and represent almost triple the amount burned in the previous year, which itself was a lot. Smoke from Canadian fires, particularly those in Quebec, blanketed many cities in the United States and made its way as far south as Florida.

An alarming aspect of the Canadian fire season is that it didn’t ever really end. Late in the winter, 149 active wildfires are still burning across Canada. 92 are in British Columbia, 56 in Alberta, and one in New Brunswick. In these places, the wildfire season is yearlong.

These overwintering fires have come to be known as zombie fires. They burn slowly below the surface during the winter. Many areas in the north contain porous peat and moss ground cover and these act as underground fuel for smoldering fires.

Wildfires have become more prevalent in Canada because the changing climate has brought about increases in the hot, dry, and gusty conditions that lead to drought.

Many of the zombie fires don’t pose an increased threat of triggering wildfires in the spring because they are in places that are already so charred that there is nothing left to burn. But others are in drought areas that are basically tinder boxes ready to burst into flame once spring arrives.

Overall, Canadian government officials are warning that this year’s wildfire season is likely to be even worse than last year’s, particularly in the Western provinces of British Columbia and Alberta.

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As ‘Zombie Fires’ Smolder, Canada Braces for Another Season of Flames

Photo, posted June 30, 2023, courtesy of P. McCabe / EU via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Cyber protection for apple orchards

April 2, 2024 By EarthWise Leave a Comment

Spring frosts represent a real danger for apple orchards. The changing climate has brought about periods of unusually warm weather at times early in the year that have caused trees and other flowering plants to bloom early. For apple growers, this has made their orchards more susceptible to the damaging effects of extreme cold events.

Apple growers attempt to prevent this damage by heating the canopies of their orchards, but these efforts tend to be inefficient. Applying heat is one of the most effective methods to prevent apple flower bud damage, but it is difficult to determine when and where to apply heat in orchards.

Researchers at Penn State University have developed a frost-protection cyber-physical system that autonomously makes heating decisions based on real-time temperature and wind-direction data. Their system includes a temperature-sensing device, a propane-fueled heater that adjusts the direction where it provides heat, and an unmanned ground vehicle that moves the system through an apple orchard.

The results of tests of the system were published in the journal Computers and Electronics in Agriculture, and the findings show that it greatly reduced damage to apple tree buds in tests conducted at low temperatures, doubling or tripling the amount of time that trees were protected.

The equipment used for the study mostly consisted of off-the-shelf parts and cost about $5,000, most of which was for the vehicle. The researchers envision that even a very large orchard could be protected by multiple units guided by an aerial drone monitoring canopy temperatures. Further research will aim to bring the technology to point where it can enter the marketplace and be available to apple growers.

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Cyber-physical heating system may protect apple blossoms in orchards

Photo, posted September 6, 2017, courtesy of Sue Thompson via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

What did the record warmth of 2023 mean?

January 16, 2024 By EarthWise Leave a Comment

2023 was the warmest year in the 174 years of global temperature record-keeping. According to some analyses, it may have been the warmest year in the past 125,000 years.

There were incredible heatwaves in Arizona and Argentina. There were relentless wildfires across Canada. The wintertime ice coverage in the seas surrounding Antarctica was at unprecedented lows

The global temperatures in 2023 did not just beat prior records; they smashed them. Every month from June through November set all-time monthly temperature records. The US Northeast saw springlike temperatures at the end of the year. The high temperature in Buffalo, New York on Christmas Day was 58 degrees.

Climate scientists have been predicting the warming trend that has been ongoing over the past several decades. Indeed, computational models for 2023 called for a warm year. Various models had a variety of projected temperatures and 2023’s heat was still broadly within the range of what was projected, although certainly at the high end.

The question is whether last year was an indicator that the planet’s warming is accelerating faster than we expect or that it just was a particularly warm year because of cyclical factors such as the El Niño that appeared last spring.

One theory that is being explored is that various types of industrial pollution have previously actually served to cool the atmosphere over time and as those sources are reduced for public health reasons, the warming effects of greenhouse gases have accelerated.

Currently, there is no consensus about why it seems to be getting warmer even faster than many climate models predict. What there is no doubt about is that it is not a good thing.

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Earth Was Due for Another Year of Record Warmth. But This Warm?

Photo, posted June 8, 2023, courtesy of Anthony Quintano via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Weaning Off Fossil Fuels | Earth Wise

June 2, 2022 By EarthWise Leave a Comment

We recently talked about California producing 97% of its electricity from renewables on one sunny afternoon in April. On May 8th, the state produced enough renewable electricity to meet 103% of consumer demand. These sorts of records are likely to be increasingly commonplace in the spring when the weather is still fairly mild.

But even while renewables were producing more electricity than California needed, natural gas power plants in the state were still running.

Turning off the gas power plants is not possible. The reason is that as the sun sets and solar farms stop producing power, California has to quickly replace the power with electricity from other sources. Natural gas plants are massive industrial facilities that cannot be turned on and off rapidly. Some take as many as 4 to 8 hours to switch on. Operators back them down as far as they can go, but even when there is plenty of solar power during the day, natural gas plants are still running.

The state is rapidly building huge battery storage projects as an alternative to gas plants, but so far, they are still only a small fraction of what is needed. Wind power is another part of the solution along with hydropower. California imports some power from other states as well and, in fact, also exports power when there is excess. But keeping the energy system balanced and stable is an ongoing challenge.

California is building huge amounts of solar, huge amounts of wind, and huge amounts of energy storage, which should get the state to at least 90% of the way to a clean grid. It’s the last 5-10% that is much harder to accomplish before natural gas is no longer part of the energy system.

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California just ran on 100% renewable energy, but fossil fuels aren’t fading away yet

Photo, posted January 10, 2014, courtesy of F.G. via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Record Renewable Use In California | Earth Wise

May 19, 2022 By EarthWise Leave a Comment

California, the most populous state, is the second largest electricity user. Only Texas, the second most populous state, uses more energy, in part because it consumes large amounts in refining fossil fuels. Overall, California uses about 8% of the electricity generated in the U.S.

Thus, it was a significant milestone when briefly, on April 3, a record 97.6% of the energy on California’s statewide grid came from renewable energy resources. (The previous record of 96.4% was set just a few days earlier).

Renewable energy’s share of the power typically peaks in the spring when mild temperatures keep demand relatively low and higher sun angles drive greater solar energy production.

On April 8, a record peak solar power production was set at 13,628 megawatts just after noon. On March 4, the state set an all-time wind generation record of 6,265 megawatts.

California now has over 15,000 MW of grid-connected solar power and 8,000 MW of wind. Another 600 MW of solar and 200 MW of wind are coming online by June. The state also has about 2,700 MW of energy storage online and that will climb to 4,000 MW by June.

In 2020, 34.5% of the state’s retail electricity sales came from wind and solar sources. Adding in hydropower and nuclear power, nearly 60% of the state’s electricity came from non-fossil fuel. Despite the effects of drought on hydropower generation and the impact of the pandemic on the pace of renewable energy projects, California continues its dramatic transition to sustainable energy.

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Solar and wind notched records as renewables met California’s energy demand

Photo, posted September 20, 2016, courtesy of Tom Brewster Photography / BLM via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Spring is Sooner And Warmer In The United States | Earth Wise

April 7, 2022 By EarthWise Leave a Comment

Despite some March snowstorms in the Northeast, the record shows that spring is getting warmer and coming sooner in the United States.

The independent research organization Climate Central analyzed 52 years of spring data across the United States. Half of the 234 locations studied had an increase in their average spring temperatures of at least 2 degrees. About 70% of the locations had at least 7 extra days above their normal spring temperatures. About the only part of the country where spring hasn’t gotten much warmer is in the upper Midwest.

Over that time period, the average spring temperature in Albany, NY has increased by 2.1 degrees. And compared with 1970, there are now 11 more warm spring days in New York’s Capital Region.

Spring warming has been greatest in the Southwest. The three cities with the largest temperature increases were Reno, Nevada at 6.8 degrees, Las Vegas, Nevada with 6.2 degrees, and El Paso, Texas with 5.9 degrees.

Spring has been arriving early as a result of the warming conditions, cutting into the cold winter months. While an early spring sounds like nothing but good news, the shift can cause problems. An early spring and early last freeze can lengthen the growing season. With it comes the arrival of mosquitoes and pollen and its associated allergy season.

A greater problem is that spring warming can disrupt the timing of ecosystem events. For example, migratory birds could show up at the wrong time, impacting their food availability and breeding success.

As the overall climate changes, so does the spring.

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2022 Spring Package

Photo, posted March 20, 2011, courtesy of Suzie Tremmel via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Spring Is Coming Earlier In Britain | Earth Wise

March 1, 2022 By EarthWise Leave a Comment

The United Kingdom has some of the most detailed records of seasonal changes anywhere in the world. Since the 18th century, observations of seasonal changes have been recorded by scientists, naturalists, amateur and professional gardeners, and organizations such as the Royal Meteorological Society. Researchers at two British institutions have collected and collated these records into a database they call Nature’s Calendar, which currently has about 3.5 million records going back to 1736.

By analyzing more than 400,000 observations of 406 plant species in Nature’s Calendar, they found that the average first flowering date from 1987 to 2019 is a full month earlier than the average from 1753 to 1986. The change correlates very well with rising global temperatures.

The ecological risks associated with earlier flowering times are high. When plants flower too early, a late frost can kill them – a phenomenon most gardeners have experienced at some point or another. Beyond that, plants, insects, birds, and other wildlife have co-evolved to be synchronized with plants in their development stages. A certain plant flowers and attracts a certain kind of insect, which then attracts a particular kind of bird, and so on. If plants get out of sync with the animals in the ecosystem and the animals can’t change their behavior quickly enough, it can lead to species collapse.

If global temperatures continue to increase at their current rate, spring in the UK could eventually start in February, creating serious problems for many of the species that inhabit forests, gardens, and farms. The dangers of climate change are not just about extreme weather.

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UK plants flowering a month earlier due to climate change

Photo, posted February 1, 2012, courtesy of Mandy via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Global Light Pollution

October 14, 2021 By EarthWise 1 Comment

Light pollution is excessive or obtrusive artificial light. It’s a consequence of industrial civilization. Too much artificial light can cause a host of problems, including disrupting ecosystems, causing adverse health effects, and wasting energy.

According to a new study led by researchers from the University of Exeter in the U.K., global light pollution has increased by at least 49% over 25 years. But this figure only includes light visible via satellites. Scientists estimate that the true increase may be significantly higher – up to 270% more globally.

That’s because there is a hidden impact of LED technology that isn’t accounted for in the satellite data. LEDs emit more blue light than previous lighting technologies, but satellite sensors fail to pick up this blue light. This leads to a large underestimate of global light pollution.

The researchers examined light pollution from 1992 to 2017. They found persistently increasing light pollution in Asia, South America, Oceania and Africa. In Europe, detected light increased until around 2010, after which it leveled off. In North America, artificial light appears to be on the decline. However, the researchers point out that the satellites inability to detect blue light of LEDs means that light pollution has likely actually increased in most locations.

Light pollution has widespread impacts on both animals and plants. For example, light pollution can confuse the migratory patterns of animals and change predator-prey relationships. It’s also been shown to cause trees to bud earlier in spring.

While there’s no off switch for the planet, there are ways that we could reduce the amount of light drastically with little impact on our lives.

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Rapid increase in global light pollution

Photo, posted November 2, 2008, courtesy of Timothy Tsui via Flickr.

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Drought And Desalination | Earth Wise

October 11, 2021 By EarthWise Leave a Comment

The Western US is currently experiencing what might be the worst drought in over 1,000 years. The region has seen many droughts in the past, but the changing climate is making dry years drier and wet years wetter. Diminishing snow-packs mean that rivers, streams, reservoirs, and soil are not replenished enough in the spring and summer.

Meanwhile, the Southwest has seen a growth rate over the past 60 years that is twice that of the rest of the country. More and more people are moving to areas expected to get even drier in the years to come. There have been unprecedented water allocation cuts from the Colorado River – which provides water to seven states – and there have been shutdowns of hydroelectric power plants.

Only three percent of the planet’s water is fresh water and much of that is not available for our use. Over 120 countries have turned to desalination for at least some of their drinking water. In the US, the largest plant is in Carlsbad, California and a huge new plant is likely to be built in Huntington Beach, California.

Desalination has its drawbacks. It is expensive, consumes large amounts of energy, and has detrimental environmental impacts. Most of the world’s desal plants now use membrane filtration technology but there are still many that use the thermal distillation method.

There are efforts around the world aimed at improving desalination. A giant project in Saudi Arabia is based on solar heating of sea water. The U.S. Army and the University of Rochester are working on a different solar-based system. European companies are developing a floating seawater desalination plant powered by wind energy.

Droughts seem to be here to stay. Finding better ways to get fresh water is essential.

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A 1,000 Year Drought is Hitting the West. Could Desalination Be a Solution?

Photo, posted May 31, 2021, courtesy of Frank Schulenburg via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Artificial Light And Nature | Earth Wise

December 4, 2020 By EarthWise Leave a Comment

Most of us are familiar with air pollution, water pollution, soil pollution, and noise pollution. But it turns out that light can also be a pollutant as well.

Light pollution is a consequence of industrial civilization. Sources of light pollution include building interior and exterior lighting, advertising billboards, factories, commercial properties, streetlights, and sporting venues.

According to findings in a new report from the University of Exeter, artificial nighttime lighting has a wide range of effects across the natural world and should be limited wherever possible. The research team analyzed more than 100 studies and found that artificial lighting has widespread impacts on both animals and plants.

In the study, which was funded by the Natural Environment Research Council in the U.K., researchers consistently found changes to animals’ bodies and behavior as a result of artificial lighting. In particular, levels of the sleep cycle-regulating hormone melatonin were reduced by exposure to artificial lighting at night in all animal species studied.

Exposure to artificial nighttime lighting also affected the timing of animals’ activities. For rodents, which are largely nocturnal, the duration of activity was often reduced by exposure to nighttime lighting. On the other hand, for diurnal birds, exposure to nighttime lighting led to an extension of the duration of their activities.

Previous studies have found other wide-ranging impacts of nighttime lighting, from reducing pollination by insects to trees budding earlier in spring.

Artificial nighttime lighting is human driven and very disruptive to the natural world. While there’s no off switch for the planet, we could reduce the amount of light pollution drastically with no impact on our lives.

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Artificial night lighting has widespread impacts on nature

Photo, posted July 29, 2017, courtesy of spacedust2019 via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Building The World’s Largest Battery Energy Storage Plant | Earth Wise

April 6, 2020 By EarthWise Leave a Comment

The Monterey County Planning Commission has unanimously approved a joint project between Tesla and Pacific Gas and Electric to turn the Moss Landing Power Plant in California into the world’s largest battery energy storage facility.

The Moss Landing Power Plant is a natural gas-powered electricity generation plant located at the midpoint of California’s Monterey Bay. At one time, it was the largest power plant in the state of California with a generation capacity of 2560 MW but has been gradually shutting down over time.

The new facility will incorporate 1.2 GWh of storage capacity for energy generated by solar and wind systems. The stored energy will be available for use during periods of high energy demand and lower output. This is about ten times larger than Tesla’s Hornsdale energy storage project in Australia, which was three times bigger than any other batter storage facility when it was built a few years ago. In 2018, the battery system at Hornsdale made back a third of its cost in just one year. The systems make use of Tesla’s Megapack battery products which come in pre-assembled units that provide 3 MWh of energy storage capacity.

The project will make use of existing power lines to transmit energy around Monterey County and parts of Silicon Valley. Tesla and PG&E hope to break ground in early spring with completion scheduled for the end of the year. California has been adding massive amounts of wind and solar power to its electrical grid and incorporating energy storage is an important step towards creating a truly resilient power system.

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Humongous Tesla Battery Plant Approved In California Is 10× Bigger Than World’s Biggest Battery Plant

Photo, posted September 22, 2019, courtesy of Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Bird Migration And Climate Change | Earth Wise

January 22, 2020 By EarthWise Leave a Comment

A new study of bird migration shows the migration patterns are shifting as a result of climate change. Researchers at Colorado State University, the University of Massachusetts, and the Cornell Lab of Ornithology, looked at the impacts of climate change on a continental scale.

The team looked at the nocturnal migratory behaviors of hundreds of species representing billions of birds using radar and other data. They found that spring migrants are likely to pass certain stops earlier now than they would have 20 years ago. Temperature and migration timing are closely aligned and the greatest changes in migration timing are occurring in regions warming most rapidly. During the fall, shifts in migration were less apparent.

Migratory birds play an important role in ecosystems. They consume insects, disperse seeds, and perform various other significant functions. Birds serve as critical metrics of the health of ecosystems.

Bird migration is a global phenomenon that can provide unique visibility into changes in the climate. The ability to look at it on a global scale has only recently become practical as a result of big data technology and cloud computing. The team was able to crunch the numbers for the study in 48 hours, a task that previously would have taken over a year of continuous computing.

The findings have implications for understanding future patterns of bird migration because birds depend on food and other resources as they travel. As the climate changes, the timing of blooming vegetation or the emergence of insects may end up out of sync with the passage of migratory birds. This could have negative consequences for the health of migratory birds.

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Bird migration timing skewed by climate, new research finds

Photo, posted November 5, 2019, courtesy of Jerry Kirkhart via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Dangerous Cities For Migrating Birds

May 14, 2019 By EarthWise Leave a Comment

Billions of birds migrate north in the spring and south in the fall. The majority of them fly at night. But as they pass over large cities, the birds can become disoriented by bright artificial light – so-called light pollution, causing them to crash into buildings or windows.

Researchers estimate that 600 million birds die from building collisions in the United States every year. Now, a new paper from researchers at Cornell University reveals which metropolitan areas are most dangerous for birds and why.

The researchers ranked cities where, as a result of geography and exposure to light pollution, birds are at the greatest risk of becoming attracted to and disoriented by lights and crashing into buildings. They combined light pollution levels with bird density data in order to make their calculations. Their paper was recently published in the journal Frontiers in Ecology and the Environment.

Chicago, Houston, and Dallas finished as the three most dangerous cities for migrating birds. While migration routes vary depending on the season, these three cities still topped all others during both the spring and fall migrations due to their size and geographic positioning in the heart of North America’s most trafficked aerial corridors.

Audubon’s Lights Out program is one of several national efforts encouraging cities to reduce light pollution, particularly on heavy migration nights, in order to reduce bird mortality.

But homeowners need to do their part as well since an estimated quarter-million birds die from collisions with residential houses every year. The suggestion to cities and homeowners alike is the same: If you don’t need the lights, turn them off.

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