Carbon offsets: cost of CO2 removal per tree planted?

The purpose of this data-file is to calculate the cost of CO2 removal per tree planted, using a simple modelling methodology, based around the tree’s risked and discounted future carbon absorption.

The reason this is important is that some organizations, especially charities, are committing to plant trees in return for financial contributions. But in order to compare this option with other CO2 abatement options, we need to convert the units into $/ton of CO2.

This is actually quite difficult and variable. ‘Planting’ can range from scattering seed balls through to raising seedlings for 1-3 years in nurseries and then planting them out carefully. ‘Trees’ can also ultimately range from 40kg mangroves through to the 2,000 ton General Sherman Redwood.

Our methodology estimates how many tons of CO2 will be absorbed per tree as it grows to maturity, then ‘discounts’ future CO2 removals into ‘present CO2 terms’, then risks the calculation according to the survival rates and permanence of the CO2 absorption.

A good rule of thumb is that tree-planting should cost $15/ton of CO2 that is removed on a risked net present carbon basis. Numbers can realistically vary from $10-100/ton, but will mostly be in the $15-30/ton range.

Costs are likely lower than fully certified and verified nature-based CO2 removals. The trade off between lower-cost and lower-quality CO2 removals can be evaluated on a case-by-case basis (examples here).

Our key points on the cost of CO2 removal per tree planted are highlighted in our article here.

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