The amount of CO2 a tree can absorb varies depending on several factors including the species of the tree, its age, its size, the climate, and the soil conditions. Here are some general estimates:

• Young, fast-growing trees typically absorb more CO2 than older, slower-growing ones. A common figure often cited for young trees is that they can sequester about 22-48 pounds (10-22 kg) of CO2 per year.
• As trees mature, their rate of CO2 absorption tends to decrease. However, over its lifetime, a mature tree can sequester several tons of CO2.
• On average, a single mature tree might absorb about 48 pounds (22 kg) of CO2 per year, though this can vary widely.
• Over its lifetime, a tree can sequester much more. For example, an acre of forest can absorb around 2.5 tons of CO2 per year, but this would include many trees and other vegetation.
• Specific species like poplars or willows, known for fast growth, might absorb CO2 at higher rates when young, whereas hardwoods like oaks might sequester more over a longer lifetime.