Your bread, beer, and breakfast cereal are climate change's first victims

The science of staple crops and climate vulnerability

Climate change is rapidly altering the growing conditions necessary for staple crops to thrive, from optimal temperatures to adequate moisture levels. With a rise in global temperatures comes a greater risk of poor yields and reduced food availability to feed a growing population.

One 2025 study suggested that a mere 2.1° Celsius warming could decrease¹ global crop yields — including wheat, rice, maize and soybean — by 14% to 17%. Regions with limited rainfall and inadequate nitrogen levels suffer the most significant yield upsets, according to models.

A 2023-2024 analysis conducted by Carbon Brief found that crops face increasing stress from heatwaves², droughts, and shifting rainfall. Heavy precipitation and floods impacted crops in the Middle East, sub-Saharan Africa and Europe, while Jamaica lost millions of dollars worth of yams, mangoes and bananas after a 2024 hurricane.

A changing climate also creates ideal conditions for pest infestation. Findings indicate that California will see a population growth of codling moths, peach twig borers, and oriental fruit moths, emerging 28 days earlier³ than usual, with shorter generational times by up to 19 days. By 2100, farmers might see 1.4 additional generations of these insects each season.

The planetary price of a daily loaf

Think about how often you eat bread. You might make yourself toast in the morning, use a couple of slices for a sandwich, or dip them in olive oil with dinner. It is one food that most people could not imagine living without.

Many regions study the average impact of climate change on wheat production and yields. Yet, it is the heightened unpredictability and escalating economic turmoil that present extraordinary risks today.

Under a 2°C global temperature increase, researchers predict a modest 1.7% increase⁴ in harvests — due to the short-term benefits of greater carbon dioxide, which promotes plant growth — but steeper market costs. More specifically, they estimate a 6.2% increase in extreme consumer price anomalies, meaning wheat price spikes will be higher and recurring, disproportionately hurting food-insecure nations.

Hops, barley and the brewing climate crisis

Grabbing a beer at the local bar or celebrating your team’s win with a cold one is a longtime ritual for many people. Sadly, the world’s beer supply is quickly becoming a casualty of climate change, as barley and hops face increasing strains from changing weather patterns. One study shows that extreme climate-induced events could hinder barley production by 3% to 17% worldwide⁵, resulting in less grain for breweries and higher costs for consumers purchasing a traditional six-pack.

Experts also expect a drop in hops, which give beer its distinct bitterness and aroma. Research suggests that hops production could decrease from 4.1% to 18.4%⁶ by 2050 and would be accompanied by a decline in alpha acid content, which contributes to their flavor profile.

The loss of wheat and oats will also be catastrophic for the industry, especially since these ingredients enhance the smooth and creamy texture⁷ of beer, adding mild sweetness to different brews. As temperatures rise and droughts grow more frequent, it sends a signal that a beloved pastime could eventually become a rare luxury.

When breakfast gets complicated

Economists predict that the global breakfast cereal market will reach $50.66 billion by 2030⁸, increasing at a 3.5% compound annual growth rate. Consumer preferences for nutritious cereals and specialized dietary options drive this trend.

Cereal is more than a convenient go-to, though — from 2000 to 2020, it supplied 24% of daily calories⁹ in Oceania and over 50% of daily calories to populations in Asia and Africa. Unfortunately, access to this essential nutrient component is transforming as climate change and rainfall significantly reduce wheat and oat harvests.

Supply chain issues caused by extreme weather¹⁰, natural disasters, trade restrictions, and geopolitical conflicts exacerbate grain availability. With traditional sources becoming unpredictable, consumers and manufacturers are embracing substitutes such as millet, sorghum, and locally grown crops. Industry initiatives aim to build climate resilience within food logistics operations, from investing in stress-tolerant crop varieties to reformulating products for greater nutritional value and affordability.

Socioeconomic and environmental ripple effects

Farmers are not the only ones who will experience the effects of climate change on staple grains. Such an occurrence will threaten livelihoods and rural communities worldwide. With every 1°C increase in global temperatures¹¹ comes a loss of approximately 5.5 × 1014 kilocalories annually. This equates to 120 fewer kilocalories per person per day, or 4.4% of the recommended daily intake.

In particular, smallholder producers will face financial constraints, while rural areas that rely on local grain yields will experience food insecurity. Mitigation strategies and wage increase may offset up to 34% of these losses by 2100, but much of the deficits will continue for all major grains except rice. Systematically, this type of instability hinders progress in achieving biodiversity preservation and sustainable development, as intensified crop production forces agricultural land expansion¹², disrupts carbon stocks, and imparts stress on habitats.

Opportunities for adaptation and innovation

Prioritizing innovation is key to safeguarding staple grain crops in the face of climate change challenges. Efforts in crop breeding are increasing, with the development of drought-tolerant wheat varieties¹³ to ensure adequate yields under abnormal weather conditions.

Regenerative farming has also gained popularity, focusing on building soil health¹⁴, enhancing nutrient cycling and moisture retention, and promoting biodiversity. Several policies support this approach, including the European Union’s Common Agricultural Policy, which delivers funding for organic farming, agroecology, and sustainable practices.

The Food and Agriculture Organization of the United Nations also encourages eco-friendly soil management, including the 4 per 1,000 Initiative, which promotes increasing organic soil carbon stocks by 0.4% annually worldwide as a food security and climate strategy.

Crop rotation is another sustainable approach to climate adaptation in agriculture. Waiting to replant the same crop in one area every three to four years¹⁵ helps prevent nutrient loss in the soil and boosts yields.

More recently, researchers have explored intercropping — an ancient approach to growing multiple crops together. Preliminary studies suggest that intercropping enhances yields and improves climate resilience¹⁶ by increasing drought tolerance, improving weed resistance, and preventing disease and pest infestations.

Rethinking daily kitchen staples

Bread, beer, and breakfast cereal are greatly threatened by climate change, disrupting grain yields, global food security, and supply chain operations. Industry experts and scientists must promote sustainable agricultural practices and evidence-based policy frameworks to safeguard essential food products.

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Footnotes

1. https://www.sciencedirect.com/science/article/abs/pii/S0168192325001443

2. https://interactive.carbonbrief.org/crops-extreme-weather/index.html

3. https://www.sciencedirect.com/science/article/pii/S0048969723062320

4. https://www.sciencedirect.com/science/article/pii/S2590332222003712

5. https://www.sciencedirect.com/science/article/pii/S0048969724011860

6. https://www.nature.com/articles/s41467-023-41474-5

7. https://lcdmcorp.com/grain-flow-101/how-is-grain-used-in-breweries/ 

8. https://www.grandviewresearch.com/industry-analysis/breakfast-cereals-market

9. https://www.iatp.org/climate-change-risks-food-trade

10. https://www.sciencedirect.com/science/article/pii/S240584402410761X

11. https://www.nature.com/articles/s41586-025-09085-w

12. https://www.sciencedirect.com/science/article/pii/S2666683924000427

13. https://www.sciencedirect.com/science/article/pii/S1687850724003820

14. https://environment.co/crop-rotation-families/ 

15. https://pmc.ncbi.nlm.nih.gov/articles/PMC12576041/

16. https://link.springer.com/article/10.1007/s13593-022-00832-1