The amount of carbon that a tree captures per year depends on a number of factors, including the species of tree, the size of the tree, and the conditions in which the tree is growing. Some estimates suggest that a mature tree can absorb around 48 pounds (22 kilograms) of carbon dioxide per year, while smaller trees may absorb less.

However, these estimates can vary significantly depending on the specific circumstances of the tree. For example, trees growing in tropical rainforests tend to absorb more carbon dioxide than trees growing in other types of environments, due to the high levels of sunlight and humidity in these regions. Additionally, trees that are exposed to high levels of pollution or that are stressed due to other factors may absorb less carbon dioxide.