Reintroducing wolves to the Scottish Highlands could lead to an expansion of native woodland which could take in and store one million metric tons of CO2 annually, according to a new study led by researchers at the University of Leeds.

The team modeled the potential impact that wolves could have in four areas classified as Scottish Wild Land, where the eating of tree saplings by growing red deer populations is suppressing natural regeneration of trees and woodland.

They used a predator–prey model to estimate that a reintroduction of wolves to areas in the Cairngorms, South-west Highlands, Central Highlands and North-west Highlands would lead to a total population of around 167 wolves—enough to reduce red deer populations to a level that would allow trees to regenerate naturally.