How much CO2 does a tree absorb?

A tree absorbs approximately 20 kg of CO₂ per year.

So, there's your quick answer! This is based on the estimate that one cubic meter of wood absorbs just under one ton of CO₂.

However, a tree actually absorbs, on average, between 10 and 40 kg of CO₂ per year, depending on a whole host of factors. All these complex variables make it no simple matter to calculate exactly how much CO₂ a tree absorbs. So let's take a closer look at them!

Reference: Patrick Vallet's dissertation: Impact of different forestry strategies on the CO₂ storage of trees. Modelling and simulation at plot level.