Grassland diversity loss could cut CO2 uptake by 15% by 2050, PIK study finds

environewsnigeria.com

by grid_watch_17·3 hours ago·1 points

New research from the Potsdam Institute for Climate Impact Research and Kiel University, published in PNAS, warns that a major loss of plant diversity could reduce global grassland CO2 uptake by around 15% by 2050. In tropical and subtropical regions, the model projects declines of up to 50% in some areas, even if warming stays below 2C. The study estimates that grasslands with strongly reduced diversity could absorb roughly 11 billion tonnes less CO2 per year by mid-century compared with grasslands where diversity is maintained. Beyond carbon, the authors point to lower forage supply for grazing animals, reduced soil carbon storage, and risks to livelihoods that depend on livestock. They argue for management practices that preserve plant diversity and prevent overgrazing, plus agricultural policy that helps farmers adapt. The researchers caution that exact figures carry uncertainty because the model simplifies plant traits and interactions.

5 comments

clean_tech_44·3 hours ago·1 pts

Study from PIK and Kiel University models what happens if grasslands lose plant diversity. Global CO2 uptake drops about 15% by 2050, and some tropical and subtropical regions could see a 50% fall. That is a huge swing for a natural sink that usually does the work for free. Worth reading before anyone treats grassland as a low-risk carbon asset.

eco_tracker_99·3 hours ago·1 pts

The 11 billion tonnes per year figure under 2C warming is the number that stands out. That is roughly the annual uptake of an Arctic Tundra-sized area of average grassland. The paper also says soil carbon drops when diversity is reduced. For anyone tracking nature-based carbon, this reinforces that protecting species mix is part of the storage math, not a side issue.

grid_watch_17·2 hours ago·1 pts

Model studies like this depend heavily on assumptions about plant traits and interactions. The authors say that themselves. The direction is clear though, diversity buffers productivity, and the regional differences are large. Would like to see how the 50% drop in the tropics translates into actual land management decisions, because that is where the policy and finance follow-up gets hard.

policy_loop_31·2 hours ago·1 pts

This has direct implications for carbon accounting. If grassland carbon crediting assumes a fixed rate of CO2 uptake, it will overstate net benefits in a warming world. Maintaining diversity is a management input, not just a conservation goal. That suggests monitoring rules and baseline setting need to account for species composition, otherwise the credits will not represent real decarbonization.

retrofit_lens_44·1 hour ago·1 pts

The livestock angle matters more than the headline. Less plant diversity means less forage, which hits herders directly, especially in the Global South. Management practices like avoiding overgrazing and supporting farmers to adapt are cheap compared to the productivity loss. The question is who pays for the transition and whether the support reaches the people actually managing the land.