The tiny organisms transforming farming | Karsten Temme - TED Talks Daily Recap

Podcast: TED Talks Daily

Published: 2026-02-27

Duration: 11 min

Summary

Karsten Temme discusses how re-engineering soil microbes can replace synthetic fertilizers, leading to cost reductions, environmental benefits, and increased crop yields. He illustrates this potential through examples from farmers in the U.S., Brazil, and Kenya.

What Happened

In this episode, host Elise Hugh introduces bioengineer Karsten Temme, who believes that the future of farming lies in the microscopic world beneath our feet. Temme shares his vision of using engineered microbes to replace much of the synthetic fertilizer currently used in agriculture. He highlights the significant financial and environmental costs associated with conventional fertilizers, noting that last year, farmers globally spent over $200 billion on nitrogen fertilizers alone, which contribute to greenhouse gas emissions and dead zones in oceans. Temme emphasizes the need for a more biological approach to support farmers and reduce reliance on synthetic solutions.

Temme recounts his journey of developing these microbes, explaining how he and his team have reprogrammed their DNA to enhance nitrogen fixation, a natural process that allows plants to absorb nitrogen from the air. He shares a breakthrough moment when they observed a corn seed germinating with engineered microbes that actively supplied nitrogen. This success has led to practical applications in farming, with farmers like John in Michigan reporting increased yields and reduced fertilizer use. John's farm has seen yields rise from 8,500 to 11,500 kilos of corn per hectare by using less fertilizer, showcasing the potential of this microbial solution.

The episode also features farmers from Brazil and Kenya, illustrating the widespread applicability of this innovation. Charles, a Brazilian farmer, is using these microbes to enhance his crop yields while decreasing his dependency on imported fertilizers. Margaret, a smallholder in Kenya, faces significant challenges with traditional fertilizers, but with the help of engineered microbes, she can secure her family’s food security more effectively. Temme’s insights suggest a promising future where microbes become essential partners in farming, ultimately contributing to a more sustainable agricultural landscape.

Key Insights

• Re-engineering soil microbes can significantly reduce the need for synthetic fertilizers, benefiting both the environment and farmers' profits.
• The process of nitrogen fixation by microbes can be enhanced using modern tools like gene editing to support plant health and yield.
• Farmers using these engineered microbes report improved crop yields while decreasing their fertilizer inputs, exemplifying the effectiveness of this approach.
• The initiative is not only beneficial for large farms in developed countries but also has the potential to support smallholder farmers in developing regions.