For this portfolio, we took two things into account. What is the cost to our society of one ton emitted, and what is the price that the Danish Council on Climate Change recommends for a carbon tax.

This portfolio removes 67% is removed with a permanence guaranteed to more than 100 years, and 17% is removed on a scale which is counted in 1000s of years. 

We still retain a solid share of nature-based solution, keeping the portfolio cost down while having benefits beyond carbon removal.