DOI: 10.5281/zenodo.17610157
title: Climate clubs: An experimental study of Nordhaus' proposal to mitigate climate change

description: Dataset Description: Climate_Clubs_data.csv

This dataset contains data from a laboratory experiment on cooperative behavior in the context of climate clubs and public goods games. It combines data from four experimental treatments (T1–T4) conducted as part of the “Climate Clubs” project.

The dataset includes 2,700 observations and 27 variables, each corresponding to individual-level decisions and outcomes across multiple rounds of the experiment. Each observation represents one participant’s actions in one round within a specific experimental session and group.



File Overview





Filename: Climate_Clubs_data.csv




Format: CSV (comma-separated values)




Number of rows: 2,700




Number of columns: 27




Encoding: UTF-8





Variable Description








Variable
Description




participant.id_in_session
Numeric identifier for the participant within a session.


participant.code
Unique alphanumeric participant code assigned by oTree.


participant._index_in_pages, participant._max_page_index, participant._current_app_name, participant._current_page_name
Technical variables automatically generated by oTree for session management and page tracking.


participant._round_number
Current round number within the session.


participant.time_started
Timestamp indicating when the participant started the session.


player.id_in_group
Player’s position within the experimental group.


player.automatic_decision
Binary variable indicating whether the system made an automatic decision (1 = yes, 0 = no).


player.pledge
Participant’s initial pledge decision (if applicable in the treatment).


player.commitment
Participant’s commitment decision in the implementation phase (if applicable).


player.endowment
The player’s individual endowment in that round (measured in experimental currency units).


player.contribution
Amount contributed to the public good (in experimental currency units).


player.my_total_payment
Participant’s total cumulative earnings by the end of the session.


player.payoff_ronda
Participant’s payoff in the specific round.


player.X, player.Y
Coordinates or auxiliary variables used to record decisions or outcomes in the experimental interface.


player.timeout_pledge, player.timeout_commit, player.timeout_contr
Binary indicators of whether the participant timed out (1 = timeout, 0 = response given) during each decision stage.


group.id_in_subsession
Numeric identifier for the group within the session.


group.coalition_flag
Indicates whether a coalition was formed in the group during that round (1 = coalition formed, 0 = not formed).


subsession.round_number
Round number within the experimental subsession.


session.code
Unique session identifier assigned by oTree.


group
Alphanumeric group identifier (e.g., “1A”, “2B”).


treatment
Experimental treatment condition (T1–T4).








Notes





Treatments T1–T4 correspond to different experimental conditions related to decision-making in public goods games (e.g., with or without unanimity, with or without sanction mechanisms).




Missing values (NA) occur where variables are not applicable to certain treatments or decision stages.




Time variables are in UTC.




All identifiers (participants, sessions) are anonymized and non-identifiable.