Grassland Diversity Loss Has Threatened Carbon Uptake
A new study reveals that declining plant variety could significantly hamper the carbon absorption capacity of global grasslands.
Updated on Oct. 13, 2026 in Environmental
Live Poll
Should nations prioritize maintaining plant diversity to ensure future agricultural and climate stability?
A study published in PNAS warns that declining plant diversity may cause grasslands to absorb 15 per cent less carbon dioxide by the middle of the century. This reduction in sequestration capacity could reach 11 billion tonnes of carbon dioxide annually by 2050 under 2 degrees Celsius of warming.
Why it matters
Maintaining diverse plant communities is critical because it allows species adapted to changing environmental conditions to expand and compensate for others. Without this resilience, ecosystems may lose their ability to effectively sequester carbon and support agricultural productivity.
Researchers utilized simulations covering 1850 to 2100 using climate data from five general circulation models to categorize species into competitors, stress-tolerant plants, and ruderals. The model projected sequestration losses of up to 50 per cent in certain regions.
The players
PNAS
The Proceedings of the National Academy of Sciences is a peer-reviewed scientific journal that publishes high-impact research across biological, physical, and social sciences.
The details
The analysis shows that while carbon sequestration could plummet globally, some regions including parts of Africa and Spain might see productivity increases of up to 20 per cent under specific reduced diversity scenarios. Conversely, Paraguay and India face the strongest projections for productivity losses due to diminished plant variety.
Timeline
The modeled simulation period spanned from 1850 to 2100.
Carbon absorption reductions are projected to hit critical levels by 2050.
The Big Picture
This study evaluates grassland carbon performance relative to the Paris Agreement's 2 degrees Celsius warming threshold. The findings mark a departure from models that assume vegetation will respond uniformly to warming, highlighting how biodiversity loss acts as an independent driver of climate feedback.
A decline in grassland productivity and carbon storage could lead to reduced forage availability, potentially impacting global livestock production and food prices. These ecosystem changes illustrate the long-term material risks posed by biodiversity loss to agricultural stability.
The takeaway
Preserving diverse plant ecosystems is essential for maintaining natural carbon sinks that mitigate the effects of global warming. Policymakers and land managers may need to prioritize biodiversity to stabilize regional agricultural productivity against climate fluctuations.
Further reading
For more information on climate resilience, explore the Environmental section.
Live Poll
Should nations prioritize maintaining plant diversity to ensure future agricultural and climate stability?
