productivity

Climate change and hunger

July 14, 2025 By EarthWise Leave a Comment

Worldwide, people are producing more food than ever, but most of that production is concentrated into only a handful of places. For example, fully one third of the world’s wheat and barley exports come from Ukraine and Russia. Across the globe, several major crop-growing regions, including some in the United States, are heading towards sharp drops in harvests as a result of climate change.

These forthcoming changes are not only bad news for farmers, but they are also bad news for everyone who eats. According to a new study published in the journal Nature, it is going to become harder and more expensive to feed a more crowded and hungrier world.

Specifically, under a moderate greenhouse gas emissions scenario, six key staple crops will see an 11.2% decline by the end of the century, compared to a world without warming. The largest drops won’t be in the poorer, more marginal farmlands, but rather in places that are major food producers. These are places like the US Midwest that has long benefited by having both good soil and ideal weather for raising crops like corn and soy.

When the weather is not ideal, it can drastically reduce agricultural productivity. Extreme weather in many places has already damaged crops. Flooding has destroyed rice in Tajikistan, cucumbers in Spain, and bananas in Australia. Severe storms in the US this spring caused millions of dollars’ worth of damage to crops.

As the climate changes, rising average temperatures and changing rainfall patterns are likely to diminish yields and extreme weather events like droughts and floods could wipe out harvests more often. As climate change intensifies, agriculture is the most weather-affected sector of the economy.

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How climate change will worsen hunger

Photo, posted may 20, 2011, courtesy of Lance Cheung / USDA via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Feeding the future

June 9, 2025 By EarthWise Leave a Comment

Climate change is already affecting the yields of major staple crops around the world, and researchers warn that the impacts will become more severe over time. Rising temperatures, shifting rainfall patterns, and more frequent extreme weather events are disrupting growing seasons and reducing agricultural productivity.

Addressing these growing threats requires rethinking how we grow, distribute, and consume food. To kick off Climate Solutions Week, we wanted to examine some solutions that could make food systems more resilient, sustainable, and adaptable to our rapidly changing environment.

One solution is Climate-Smart Agriculture, which blends traditional practices with modern techniques to boost productivity while reducing greenhouse gas emissions. Methods like zero tillage, intercropping, and crop diversification could improve soil health, conserve water, and help farms withstand climate extremes.

Expanding the production of highly nutritious and climate resilient food crops – like millet, sorghum, teff, quinoa, chickpeas, and tepary beans – will also have an important role to play. At the same time, reducing food waste through better storage, labeling, and surplus food re-use could help meet demand without increasing production pressure.

Agriculture is the largest user of freshwater globally, and climate change is intensifying water shortages. Farmers will need to transition to water-efficient farming practices, including drip irrigation, rainwater harvesting, and the reuse of treated wastewater.

Together, these solutions could help revolutionize the global food system to both feed a growing population and help protect the planet.

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Climate-smart agriculture

Water for Prosperity and Peace

A Food For The Future

Photo, posted October 16, 2011, courtesy of Alliance of Bioversity International and CIAT via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Drying rivers and hydropower

February 7, 2025 By EarthWise Leave a Comment

A decade ago, Ecuador began a major transition to using hydroelectric power. Like in many other South American countries, the presence of abundant rivers could supply large amounts of energy and drive economic expansion and lead to a new era of prosperity.

This ambitious plan has run into the impacts of climate change. An extraordinary drought has engulfed much of South America, drying rivers and reservoirs, and has put Ecuador’s power grid on the brink of collapse.

Since September, daily energy cuts in Ecuador have lasted as long as 14 hours. An industry group says that the nation is losing $12 million in productivity and sales for every hour the power is out. Just a few years ago, Ecuador was making great strides in reducing poverty. Now, as the energy crisis has increased its grip on the country, much of what was achieved is being lost.

Ecuador’s situation is not unique. In recent years, abnormally dry weather in multiple places has resulted in extreme low water levels in rivers, reducing hydropower resources in Norway, Canada, Turkey, and even rainforest-rich Costa Rica.

Overall, more than one billion people live in countries where more than half of their energy comes from hydroelectric plants. With a warming climate and increasing incidence of extreme weather events like drought, it is likely that hydropower will become a less reliable energy source. More than a quarter of all hydroelectric dams are in places with a medium to high risk of water scarcity by 2050.

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The Rivers Run Dry and the Lights Go Out: A Warming Nation’s Doom Loop

Photo, posted January 15, 2020, courtesy of Pedro Szekely 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

Fungus And Carbon Storage | Earth Wise

July 26, 2023 By EarthWise Leave a Comment

It is well-known that plants and trees store enormous amounts of carbon. What has not been common knowledge is that the vast underground network of fungi across the world’s lands stores billions of tons carbon, roughly equivalent to 36% of yearly global fossil fuel emissions.

These mycorrhizal fungi form symbiotic relationships with almost all land plants. The fungi transport carbon, converted by sugars and fats by plants, into soil. They have been supporting life on land for at least 450 million years and form sprawling underground networks everywhere – even beneath roads, gardens, and houses – on every continent on earth.

An international team of scientists analyzed hundreds of studies looking at plant-soil processes to understand how much carbon is being stored by fungi on a global scale. The findings, published in the journal Current Biology, revealed that over 13 billion tons of CO2 is transferred from plants to fungi each year, more than China emits annually. This process transforms the soil beneath our feet to a massive carbon pool and constitutes the most effective carbon storage activity in the world.

Given that fungi have such a crucial role in mitigating carbon emissions, the researchers are recommending that fungi should be considered in biodiversity and conservation policies. More needs to be done in protecting the underground networks of mycorrhizal fungi. The UN has warned that human activities are degrading soils and that 90% of the world’s soils could be degraded by 2050. Not only would this obviously be very bad for the productivity of crops and plants, but we now know this could be catastrophic for curbing climate change and rising temperatures.

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Fungi stores a third of carbon from fossil fuel emissions and could be essential to reaching net zero

Photo, posted May 28, 2023, courtesy of Geoff McKay via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

The Cost Of Heat Waves | Earth Wise

December 7, 2022 By EarthWise Leave a Comment

Heat waves are defined as periods of abnormally hot weather generally lasting more than two days. To be considered a heat wave, the recorded temperatures must be substantially above the historical averages for a given area. According to climate scientists, anthropogenic climate change is likely causing heat waves to increase in both frequency and intensity.

According to a new study by researchers from Dartmouth University, climate change-driven severe heat waves have cost the world economy trillions of dollars since the early 1990s.

In the study, which was recently published in the journal Science Advances, researchers combined in-depth economic data for regions worldwide with the average temperature for the hottest five-day period —a commonly used measurement of heat intensity—for each region in each year. The research team found that between 1992 and 2013, heat waves statistically coincided with variations in economic growth and that an estimated $16 trillion was lost to the effects of high temperatures on human health, productivity and agricultural output.

The results of the study underscore issues of climate justice and inequality. According to researchers, the economic costs of extreme heat have been and will be disproportionately borne by the world’s poorest nations. While economic losses due to extreme heat events averaged 1.5% of GDP per capita for the world’s wealthiest regions, the researchers found that low-income regions suffered a loss of 6.7% of GDP per capita. Most of these low-income nations have contributed the least to climate change.

According to the research team, immediate action is needed now to protect vulnerable people during the hottest days of the year.

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Heat Waves Have Cost World Economy Trillions of Dollars

Photo, posted July 23, 2021, courtesy of Martin Fisch (marfis75) via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Climate Change And Sleep | Earth Wise

June 22, 2022 By EarthWise Leave a Comment

It’s no secret that our planet is heating up. According to scientists, the warming is primarily the result of increased anthropogenic greenhouse gas emissions. In fact, human activities are responsible for nearly all of the increase in atmospheric greenhouse gas emissions over the last 150 years.

Climate change has already left observable effects on the planet. For example, glaciers have shrunk, oceans have warmed, heatwaves have become more intense, and plant and animal ranges have shifted.

Most research examining the impact of climate change on human life has centered around extreme weather events and how they will affect social and economic health. But climate change may also have a major influence on fundamental daily human activities, like sleep, that are essential to well-being.

According to a new study recently published in the journal One Earth, scientists have found that increasing temperatures are negatively impacting human sleep around the globe. In the study, the research team analyzed anonymized global sleep data from sleep-tracking wristbands. The data included 7 million nightly sleep records from more than 47,000 adults across 68 countries, spanning all continents except Antarctica.

Before the year 2100, researchers say that suboptimal temperatures may erode 50 to 58 hours of sleep per person per year. On warm nights – where temperatures are greater than 86 degrees Fahrenheit – sleep declines an average of more than 14 minutes. To little surprise, they found that the effect of increasing temperatures on sleep loss is substantially greater for residents in lower income countries as well as in older adults.

Sleep is an essential restorative process integral to human health and productivity. And it’s threatened by our changing climate.

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Climate change likely to reduce the amount of sleep that people get per year

Photo, posted March 16, 2006, courtesy of Joe Green via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Emissions From Global Computing

October 20, 2021 By EarthWise Leave a Comment

A recent study from Lancaster University in the UK has concluded that global computing is likely to be responsible for a greater share of greenhouse gas emissions than previously thought and that share is continuing to grow.

Previous calculations of the contributions from information and communications technology (or ICT) estimated that globally it accounts for 1.8 to 2.8% of total emissions. According to the new study, these estimates likely fall short of the sector’s real climate impact because they only show a partial picture.

Prior estimates do not account for the full lifecycle and supply chain of ICT products and infrastructure. They do not include the energy expended in manufacturing the products and equipment, the carbon cost associated with all the components in the products, and the operational carbon footprint of the companies producing those components.

The study argues that the true contribution of ICT to global greenhouse gas emissions could be between 2.1 and 3.9%, which is more than the aviation industry. Furthermore, the study warns that new trends in computing and ICT such as the use of big data and artificial intelligence, the so-called Internet of Things, and the use of blockchain and cryptocurrencies, risk driving further substantial growth in ICT’s greenhouse gas footprint.

It has been a commonly held believe that ICT and computing technologies lead to greater efficiencies across many other sectors, leading to savings in net greenhouse gas emissions. According to the new study, the historical evidence indicates the opposite. ICT has driven wide-ranging efficiency and productivity improvements, but the net result in emissions has been that they have been growing steadily.

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Emissions from computing and ICT could be worse than previously thought

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

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The Benefits Of No-Till Farming | Earth Wise

October 5, 2021 By EarthWise Leave a Comment

No-till farming is not new. In fact, it was used as far back as 10,000 years ago. But during the 18th and 19th centuries, tilling became popular because it allowed farmers to plant seeds more efficiently.

Tilling (or ploughing) is the process of preparing the soil for the cultivation of seeds by overturning the soil. The practice works animal manure, weeds, and other surface residues deep into the soil. While this all sounds like a good thing, it’s not.

Tilling removes plant matter and loosens the soil, leaving the soil bare and vulnerable to erosion. Tilling also displaces the millions of microbes and insects that form healthy soil biology. The long-term use of tilling can turn healthy soils into lifeless growing mediums dependent on chemical inputs.

But no-till farming also tends to rely on chemical inputs like glyphosate for weed control. According to a new study recently published in Agronomy Journal, researchers at Penn State have found that farmers using no-till farming can reduce herbicide use and still maintain crop yields by implementing integrated weed-management methods.

The research team conducted a nine-year experiment using herbicide-reduction practices in a crop rotation, which included soybean, corn, alfalfa, and canola. Some of the practices used to reduce herbicide inputs included seeding small-grain companion crops with perennials, and plowing once in six years to terminate the perennial forage rather than killing it with an herbicide.

While there was more weed biomass in the reduced herbicide treatment, the researchers found that the added weed pressure did not substantially affect crop yields.

It is possible to make agriculture more environmentally-friendly and sustainable without sacrificing productivity.

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No-till production farmers can cut herbicide use, control weeds, protect profits

Photo, posted February 11, 2019, courtesy of the United Soybean Board via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Climate Change And Farming Productivity | Earth Wise

May 3, 2021 By EarthWise Leave a Comment

The future potential impacts of anthropogenic climate change on global agricultural systems has been well studied, but how human-caused climate change has already affected the agricultural sector is not as well understood. But a new study led by researchers at Cornell University and supported by the USDA National Institute of Food and Agriculture and the National Science Foundation examined this issue.

Despite important agricultural breakthroughs in technology, fertilizer use and global trade during the past 60 years, it turns out that the climate crisis is already eroding farm productivity. According to the study, which was recently published in the journal Nature Climate Change, global farming productivity is 21% lower than it could have been without climate change. This is the equivalent of losing approximately seven years of farm productivity increases since the 1960s.

The researchers developed a model linking annual changes in weather and productivity with output from the latest climate models over six decades to quantify the effect of anthropogenic climate change on what economists call “total factor productivity.” This measure captures the overall productivity of the agricultural sector.

The research team reviewed 200 variations of the model, but the results remained largely consistent: anthropogenic climate change is already slowing down global food production. The researchers say the historical impacts of climate change have been larger in naturally warmer climates, like in parts of Africa, Asia, and Latin America.

Climate change is not some distant problem to solve in the future. It is already having an impact on the planet and it needs to be addressed now.

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Climate change cut global farming productivity 21% since 1960s

Photo, posted October 2, 2013, courtesy of the United Soybean Board via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Solar Cell Greenhouses | Earth Wise

April 21, 2021 By EarthWise Leave a Comment

A recent study at North Carolina State University has shown that it can be feasible to use see-through solar panels in greenhouses to generate electricity. The idea is to use semi-transparent solar panels on greenhouses that allow some of the light to get in for the plants to grow while making the greenhouses energy neutral or even allowing them to generate more power than they use.

The question is how the semi-transparent solar panels might affect greenhouse crops. To investigate this issue, researchers grew crops of red leaf lettuce from seed to full maturity under a standard set of growing conditions – temperature, water, fertilizer, and CO2 concentration – but varied the light they get.

A control group was exposed to the full spectrum of white light while three experimental groups were exposed to light through different types of filters that absorbed the particular wavelengths of light that would be absorbed by different types of semitransparent solar cells.

The researchers paid close attention to characteristics of the lettuce that are important to growers, grocers, and consumers: general appearance, leaf number, leaf size, and weight. The results were that the lettuce produced using all three kinds of filtered light was essentially identical to that produced in the control group. Further research is underway looking at how harvesting various wavelengths of light affects biological processes for lettuces, tomatoes, and other crops.

Getting growers to use solar-powered greenhouses would be very difficult if doing so would result in a loss of productivity. But given these experimental results, it appears as though the decision will boil down to a simple economic argument about whether the investment in new greenhouse technology would be offset by energy production and its resultant savings.

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Study Finds Plants Would Grow Well in Solar Cell Greenhouses

Photo, posted April 8, 2008, courtesy of Brian Boucheron via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Prickly Pear As A Sustainable Crop | Earth Wise

April 6, 2021 By EarthWise Leave a Comment

The fruits and pads of opuntia, better known as prickly pear cactus, find their way into people’s diets in many arid and semi-arid places around the world. In Mexico, the pads are known as nopales and are used in a variety of dishes. The pears themselves are used in jams, salads, and juices.

A five-year study by the University of Nevada Reno College of Agriculture, Biotechnology & Natural Resources investigated the prospects for cactus pear to become a major crop like soybeans and corn and to help provide a biofuel source.

As the climate changes, dry areas are going to get dryer and drought issues will increasingly affect traditional crops.

The study looked at the particular opuntia species called the spineless cactus pear and found that it had the highest fruit production while using up to 80% less water than some traditional crops. Cactus pear can be used for both human consumption and livestock feed. As a perennial crop, once the fruit and pads are harvested for food, the remaining biomass can be used for biofuel production.

Corn and sugar cane are the most utilized bioenergy crops right now, but these use three to six times more water than cactus pear. The cactus pear productivity is on par with corn and sugar cane, but not only do they use a fraction of the water, they also have higher heat tolerance.

Over 40% of land area around the world is classified as semi-arid or arid. There is enormous potential for planting cactus for carbon sequestration. If nothing else, it makes great sense to grow cactus pear crops in abandoned areas that are marginal and may not be suitable for other crops.

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Study shows cactus pear as drought-tolerant crop for sustainable fuel and food

Photo, posted April 16, 2020, courtesy of Kevin Dooley via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Essential Oils And Organic Crops | Earth Wise

November 6, 2020 By EarthWise Leave a Comment

Essential oils are concentrated liquids extracted from plants. They are called “essential” in the sense that they contain the essence of the fragrance that is characteristic of the plant. Essential does not mean indispensable or usable by the human body. But despite that fact, essential oils have been used in folk medicine throughout history.

In recent times, essential oils have frequently been used in aromatherapy. Generally speaking, medicinal uses of essential oils are controversial, and, in some cases, they have even been demonstrated to be dangerous.

Research has shown that essential oils have potential as natural pesticides. Recently, the USDA has funded research into the use of essential oils to battle pests and diseases of organic crops.

U.S. organic food sales topped $50 billion in 2018 and fruits, vegetables, and other specialty crops combined make up more than a third of organic sales. In order to meet consumer demand, farmers need ways to battle pests and diseases that often accompany organic crop growth.

A four-year project at the University of Hawaii at Manoa is entitled “Plant Safety, Horticultural Benefits, and Disease Efficacy of Essential Oils for Use in Organically Grown Fruit Crops: From the Farm to the Consumer.” The researchers will work with certified organic producers in Hawaii, Florida, South Carolina, Georgia, and California to evaluate the effectiveness of plant essential oils on major fruit pathogens such as avocado scab, anthracnose fungal disease, and powdery mildew on targeted tropical and temperate fruit crops such as avocado, mango, blueberry, and peach.

The goal is increase orchard productivity of the expanding organic fruit industry.

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Essential oils could keep pests, disease from organic crops

Photo, posted January 6, 2015, courtesy of Abi Porter via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Hacking Photosynthesis | Earth Wise

September 14, 2020 By EarthWise Leave a Comment

A team led by the University of Illinois has been pursuing a project called Realizing Increased Photosynthetic Efficiency or RIPE, which has the aim of improving photosynthesis in order to provide farmers with higher-yielding crops in an increasingly challenging climate. Photosynthesis is the natural, sunlight-powered process that plants use to convert carbon dioxide into sugars that fuel growth, development, and for us, crop yield.

If we think of photosynthesis as a factory line composed of multiple machines, the growth of plants is limited by the slowest machines in the line. The RIPE project has identified some steps in photosynthesis that are slower than others and are attempting to enable plants to build more machines to speed up those slower steps.

The researchers modeled a total of 170 steps in the process of photosynthesis to identify how plants could manufacture sugars more efficiently. In the study, the team increased crop growth by 27% by resolving two constraints: one in the first part of photosynthesis where plants turn light energy into chemical energy and one in the second part when carbon dioxide is turned into sugars.

The researchers effectively hacked photosynthesis by adding a more efficient transport protein from algae to enhance the energy conversion process.

In the greenhouse, these changes improved crop productivity by 52%, but in field trials, which are a more important test, these photosynthetic hacks boosted crop production by 27%.

Ultimately, the team hopes to translate these discoveries to a series of staple food crops, such as cassava, cowpea, corn, soybean and rice, which are needed to feed the world’s growing population this century.

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Photosynthetic hacks can boost crop yield, conserve water

Photo, posted June 14, 2017, courtesy of Alex Holyoake via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Our Growing Appetite For Energy

June 13, 2019 By EarthWise Leave a Comment

Energy consumption in the United States set a record high in 2018. Overall, energy consumption reached 101.2 quadrillion BTUs or quads last year, breaking the previous record of 101.0 set in 2007. Most of us are not too familiar with quadrillions of anything, nor with BTUs for that matter. If it is any more illuminating, 101 quads are the equivalent of about 300 billion kilowatt hours. Our energy use increased by 3.6% from 2017, which was the largest annual increase since 2010.

Wind, solar, and natural gas provided the largest increases in energy supply. In 2018, solar and wind energy were both up by 0.18 quads, representing a 22% gain for solar and a 7.5% increase for wind. Over the past ten years, overall renewable energy has doubled in the U.S., with wind increasing by a factor of 5 since 2008 and solar by an amazing factor of 48.

Natural gas generation increased by 10.7%, or a total of 3 quads over the previous year. The growth in natural gas use isn’t good news, but since much of it represents replacing coal, it at least corresponds to reduced greenhouse gas emissions.

The unfortunate part of our energy consumption is that the majority of it is still in the form of “rejected energy”. It most often takes the form of waste heat, such as the warm exhaust from automobiles and furnaces. The efficiency of our cars, lightbulbs and factories determines how much waste heat is produced and in turn how much fuel and electricity can be put to productive use.

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US energy consumption hits record high in 2018, solar/wind/natural gas grow

Photo, posted April 27, 2015, courtesy of Mathias Appel via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Hacking Photosynthesis

February 25, 2019 By EarthWise Leave a Comment

There is an enzyme known as RuBisCo that is involved in carbon fixation, the process plants use to convert carbon dioxide into sugar molecules. The RuBisCo molecule is inside the leaves of most plants and is probably the most abundant protein in the world.

RuBisCo picks up carbon dioxide from the air and uses energy from the sun to turn the carbon into sugar molecules. This process of photosynthesis is pretty much the foundation of life on Earth.

Wonderful as it is, the process is not perfect. RuBisCo is not very selective in grabbing molecules from the air. It picks up oxygen as well as CO₂ and it produces a toxic compound when it does that.

Plants operate a whole other complicated chemical process to deal with this toxic byproduct and uses up a lot of energy along the way, leaving less energy for making leaves or food that we can eat.

A research program at the University of Illinois called Realizing Increased Photosynthetic Efficiency (or RIPE) has been trying to correct this problem; they have been trying to hack photosynthesis. And they may well have succeeded.

Using genetic modification on tobacco plants, they have shut down the existing detoxification process and set up a much more efficient new one. The result is super plants that grow faster and up to 40% bigger.

The next step is to get it to work on plants that people actually rely upon for food, like tomatoes, soybeans and black-eyed peas (which are a staple food crop in sub-Saharan Africa where food is scarce.)

It will be years before we know if the process can really produce more food and be safe, but it may end up leading to a major increase in crop productivity.

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