Beavers Boost CO₂ Storage Tenfold in Wetlands: Nature’s Engineers Combat Climate Change

The beaver, already known for its role in combating droughts and floods and its critical contribution to biodiversity, continues to impress with new revelations. A study published on March 18 in the journal Nature, Communications Earth and Environment reveals that wetlands modified by beavers can store up to ten times more carbon than environments without these rodents.

Researchers spent over a decade studying a Swiss river corridor, which includes the waterbody, its banks, and surrounding areas such as wetlands. Over thirteen years, this beaver-inhabited corridor has captured nearly 1,200 tons of carbon, equating to ten tons per hectare per year. In contrast, a corridor devoid of beaver constructions would only store about one ton of carbon annually.

Beavers’ dam-building activities slow down water flow, which enhances sedimentation: the carbon found in organic material thus settles more easily into the subsoil. The flooding of riverbanks caused by these dams leads to increased plant growth and, subsequently, greater carbon storage. Over time, these areas may evolve into significant carbon sinks.

Across all river corridors suitable for beaver habitation, these wetland areas could offset up to 2% of Switzerland’s annual CO₂ emissions.