Climate Change and Diet: A Persuasive Message Approach to Increasing Cooperation

Last registered on November 25, 2019


Trial Information

General Information

Climate Change and Diet: A Persuasive Message Approach to Increasing Cooperation
Initial registration date
November 25, 2019

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
November 25, 2019, 10:57 AM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.



Primary Investigator

University of Warwick

Other Primary Investigator(s)

PI Affiliation
University of Warwick
PI Affiliation
University of Warwick

Additional Trial Information

In development
Start date
End date
Secondary IDs
The study aims to examine the effectiveness of different persuasive messages in increasing cooperation levels to a public good. The public good considered in the study is climate change and the key cooperative action is reducing meat consumption to combat climate change. The study will explore different messages to address the different barriers to cooperation.
External Link(s)

Registration Citation

Bose, Neha, Thomas Hills and Daniel Sgroi. 2019. "Climate Change and Diet: A Persuasive Message Approach to Increasing Cooperation." AEA RCT Registry. November 25.
Experimental Details


This is an online survey experiment to see the differential impact of persuasive messages on beliefs about the efficacy of actions that combat climate change and desire to modify own behaviour with regards to climate change.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
The primary outcome variable will be the change in the number of days the subject will consume meat in a week after reading the persuasive message and willingness to donate a part of their earnings to a charitable organisation for fighting climate change.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
The secondary outcome variables will include the change in beliefs about climate change and diet.
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The study will be an online survey experiment. Subjects will be compensated equally no matter their response during the study. The basic design involves asking subjects about their prior beliefs about climate change and the relationship between climate change and diet. Following this, subjects will be allocated to a control group and one of 3 treatment groups. In the control group, subjects will receive scientific information about the impact of meat consumption on the climate. In the treatment groups, in addition to scientific facts about climate and diet, subjects will receive either more similar scientific information or information about the benefits of a meat-free diet (health treatment) or influence of reducing own meat consumption on others’ diet (efficacy treatment). Following this, they will be questioned to see if their beliefs have altered about climate change and diet and if they will be willing to donate a part of their earnings to a charity working to combat climate change. Also, they will be asked their intention to reduce meat consumption. The experiment will end with some basic demographic questions like age, gender, political affiliation and family history of diseases.
Experimental Design Details
Randomization Method
Randomization by computer.
Randomization Unit
Randomization is at the individual level.
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
800 subjects.
Sample size: planned number of observations
800 subjects.
Sample size (or number of clusters) by treatment arms
200 subjects in each of the 4 (a control and 3 treatment) conditions.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Humanities and Social Sciences Research Ethics Committee , University of Warwick
IRB Approval Date
IRB Approval Number
HSSREC 03/19-20


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials