https://phys.org/news/2018-11-wealthier-people-struggle-climate.html

To do so, they designed a "lab-in-the-field" experiment involving more than 320 individuals divided into 54 groups of six people. The experiment was conducted as follows: A total of €240 was given to each group of individuals. Each member of the group was given a specific amount of money. In half of the groups, the €240 was divided evenly into €40 for each member. In the other half, the money was distributed unevenly in quantities from €20 to €60. Over the course of 10 rounds, each person then had to contribute to a common fund in order to reach a specific goal, namely €120 to be used in an activity against climate change, in this case, planting trees in Collserola. The participants were allowed to keep any money that was left over. At the start of the experiment, each participant knew how much money the others had, and at the end of each round, they could see how much money each person had contributed.

In this way, the researchers were able to test the economic effort that each individual was prepared to make for a common benefit, in this instance, the fight against climate change. The results showed that although all the groups achieved the collective goal of €120 , "the effort distribution was highly inequitable," said Jordi Duch from the Algorithms Embedded in Physical Systems (ALEPhsys) research group at the Universitat Rovira i Virgili.