Three years ago, I moved to Minnesota to sell hazelnuts. I believed strongly in their potential to fight climate change, and I was overcome with excitement – getting tongue-tied talking about what it could mean to swap the endless corn and soy for a crop with seemingly endless environmental benefits.
But I soon noticed that the attributes of hazelnuts that dazzled me enough to quit my job and move across the country were not the same attributes I was looking for when planning menus and filling up my shopping cart.
I would purchase foods based on indicators that sustainable farming practices had been used (organic, regenerative, local, etc.), but overlook the inherent qualities of the specific foods themselves. My hopes in writing this list are (1) that you too will be dazzled by the wonders of Midwest hazelnuts, and (2) that you will seek out the foods in your region that possess these underappreciated qualities. After all, these are the foods that will keep farms resilient and communities fed as the world changes around us.
Without further ado, three questions to help you identify a food as climate-friendly:
- Is it native?
While locally-grown food receives considerable attention for its sustainability, the “localness” of a food has just as much to do with the history of generations passed.
“A great opportunity lies in the consumption of … native flora adapted to the particular place we inhabit. These indigenous foods are knit into the ecology of a place, supporting the vitality of the soil, water, and wild plant and wildlife communities, as well as human needs.”
– Jared Rosenbaum, Botanist and author of Wild Plant Culture
The American hazelnut (Corylus americana) has grown wild in the forests and oak savannas of the Midwest since the melting of the glaciers. They have been tested by centuries of harsh winters, hot summers, heavy storms, dry periods, pests and diseases. They survived, and stand today ready to handle the variability of Midwestern weather conditions.
This resilience becomes even more important as the climate continues to change. In 2023, the Midwest was hit by a record drought. We feared the hazelnuts would suffer, but we ended the year with a record harvest.
Resilience in our food system is not the only environmental benefit of adding native foods to our farms and diets. If you reach into a hazelnut bush during harvest time, you’ll quickly find bird nests, caterpillars, treefrogs, and other native species that built homes on farmed hazelnut bushes just as they would in the wild. When we eat native foods, farms become habitat.
Lastly, native foods need very few human-supplied inputs to thrive. After all, they were meant to grow in a region’s natural conditions. Hazelnut farmers can expect a successful harvest without adding fertilizers or pesticides. Remember the drought I mentioned? Most hazelnut growers didn’t water their hazelnut bushes once.
Native foods like Midwest hazelnuts provide greater climate resilience, create habitat for native flora and fauna, and require fewer inputs to thrive.
Find native foods in your area! Check out the cookbooks, recipes, and restaurants from Indigenous chefs and food sovereignty organizations in your area. Peruse a foraging book and earmark native plants that are grown commercially. Visit your local farmers market and chat with farmers about why they grow what they grow.
- Is it a tree (or bush)?
I scarcely see orchards get the credit they deserve for their environmental benefits. Your average apple tree is sequestering a lot more carbon than your broccoli. Trees play a crucial role in mitigating climate change by sequestering carbon dioxide and storing it long-term, not only in the soil, but also in their woody biomass. Foods that are grown on trees, such as fruits and nuts, contribute to this process.
Hazelnut tidbit: Every few years, hazelnut production will slow and the bushes will be “coppiced.” Coppicing is the practice of cutting the bush down, but leaving the roots intact. The branches grow back quickly in a couple of years, efficiently sucking up carbon in all that new biomass, and reigniting the productivity of the bush.
Not all orchards are created equal. Take an average California almond farm, for example. Almonds are notorious for their massive water consumption, and farms have been known to sink into the ground by several inches due to the immense groundwater extraction. Furthermore, a sustainable orchard ought to have an understory. If the soil below the trees is bare, it is vulnerable to the elements and limited in its carbon storage capacity.
Hazelnut farm in Dayton, MN
- Is it perennial?
This is a big one.
If you already determined that a food came from a tree, you’ve got a yes here as well.
Perennial crops are foods that return each year without needing to be replanted. Why does this make them climate-friendly? Because the soil stays undisturbed for years at a time.
Picture an apple orchard (or hazelnut orchard) at harvest time. The trees and their roots stay intact as people or machines pick off the food. The next year, the tree blooms again.
Now picture a field of corn. Each year, the plows dig up all the roots from last year to plant anew, and all the carbon that was sequestered during that corn’s short life is released back into the atmosphere.
Some perennial crops may surprise you. Kernza is a newly developed perennial grain that is becoming a climate-smart substitute for wheat. Asparagus, rhubarb, and artichokes are all perennial vegetables.
The cookbook Perennial Kitchen by Beth Dooley is a wonderful way to explore perennials in your kitchen.
Thank you so much for reading! If you’re interested in bringing some of these dazzling Midwest hazelnuts into your kitchen, I hope you will check us out at Hazel Heart Farms! Use the code CLIMATE10 at checkout for 10% off all online orders.
Emma Dempsey is the Director of Sales and Marketing at Hazel Heart Farms, a farmer collective building a regenerative hazelnut industry in the Midwest.
Connect with Hazel Heart Farms on Instagram, LinkedIn, and Facebook!
The post Lessons from Hazelnuts appeared first on Climate Generation.
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Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
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