Africa: Rising Co₂ Is Making African Savanna Grasses Grow More - What This Means for Grazing, Fire and Carbon Storage

What the report says

African savanna grasses may be responding more strongly than previously assumed to rising atmospheric carbon dioxide, according to an analysis published by The Conversation Africa and distributed by AllAfrica on 1 October 2026. The piece, written by plant ecologist Kimberley Simpson, says researchers examined both published experiments and long-term field data from South Africa’s Kruger National Park to test how wild C4 grasses react to higher CO₂ levels under different water conditions.

The study found that grass production in Kruger increased by 28% over three decades, a period when atmospheric CO₂ rose by about 18%. The article says the clearest boost appeared in drier savannas, where extra CO₂ helped grasses lose less water while continuing to photosynthesise. The effect was weaker when water was plentiful. The authors also report that taller, more productive grass species became more prominent over time.

The findings matter because savannas cover roughly half of Africa and grasses are central to grazing, wildfire fuel and ecosystem carbon movement. More grass could mean more forage for wildlife and livestock, but it could also alter fire behaviour and the balance between trees and grasses. The article cautions that greater grass growth does not automatically mean more long-term carbon storage, since much of the material is eaten, decomposes or burns.

The piece adds that climate managers may need to factor rising CO₂ into future savanna planning, alongside rainfall and temperature trends. It suggests more monitoring is needed to understand where the extra plant material ends up and how that affects land use, fires and soil carbon.