The defaults on a carbon offsetting website can cause a large percentage of customers to select faster CO2 compensation, even if this entails higher costs. In cooperation with a web portal offering carbon offsetting, a research team at the University of Bern and Axel Ockenfels from the University of Cologne explored the question of the costs at which people are still willing to accept so called defaults. Defaults are options that kick in automatically if we do not explicitly reject them. The study has been published in Nature Human Behaviour.