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Field
Trial End Date
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Before
August 31, 2022
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After
December 31, 2022
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Field
Last Published
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Before
May 05, 2021 11:24 AM
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After
November 01, 2021 07:18 AM
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Field
Intervention End Date
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Before
June 15, 2021
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After
March 31, 2022
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Field
Primary Outcomes (End Points)
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Before
Amount of money invested in the environmental project; Pro-environmental behavioral intentions using a self-report Likert-type scale.
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After
Pro-environmental behavior measured by the amount of money invested in the environmental project
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Field
Experimental Design (Public)
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Before
In a between-subject online experiment, we will randomize the instructional language of the incentivized, environmental decision task among bilingual people who are fluent in the strong FTR language English and the weak FTR language German. We will elicit subjects’ pro-environmental behavior using a new incentivized decision task in which participants can decide between keeping money or investing money to an environmental project. Thus, this task consists of a decision tradeoff between own financial and environmental rewards. In the strong FTR treatment, the environmental decision task will be described in English, using “will” to mark future events and to describe the impact of decisions on the environment. In the weak FTR treatment, subjects will receive a German description of the environmental decision task and no future time references will be used. After the incentivized decision task, participants will complete a series of self-report scales on pro-environmental intentions, beliefs in climate change, general environmental views and answer demographic questions. In addition, all participants will be asked to take a language proficiency test for English and German.
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After
In a between-subject online experiment, we will randomize the instructional language of the incentivized, environmental decision task among bilingual people who are fluent in the strong FTR language English and the weak FTR language German. We will elicit subjects’ pro-environmental behavior using a new incentivized decision task in which participants can decide between keeping money or investing money to an environmental project. Thus, this task consists of a decision tradeoff between own financial and environmental rewards. In the strong FTR treatment, the environmental decision task will be described in English, using “will” to mark future events and to describe the impact of decisions on the environment. In the weak FTR treatment, subjects will receive a German description of the environmental decision task and no future time references will be used. After the incentivized decision task, participants will complete a series of self-report scales on pro-environmental intentions, beliefs in climate change, pro-environmental attitudes and answer demographic questions. In addition, all participants will be asked to take a language proficiency test for English and German.
We hypothesize that individuals (in particular with medium to strong pro-environmental attitudes) behave more pro-environmentally friendly in the weak-FTR treatment (German) than in the strong-FTR treatment (English).
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Field
Planned Number of Clusters
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Before
The number of participants planned for the experiment is 824 people completing the study. We advertise for a minimum of 900 participants to take into account individuals excluded due to the restrictions below.
We will exclude subjects that:
- do not complete the Prolific task within 60 minutes of starting;
- exit and then re-enter the task as a new subject (as these individuals might see multiple treatments);
- are not approved for any other reason (e.g. not having a valid Prolific ID);
- do not pass the language proficiency tests
- failed crucial attention checks
- did not answer the control question correctly
In addition, and in line with previous research, we will analyze the data once with those who do not believe in climate change and once without them. The same approach is followed for those who do not believe in the positive impact of planting trees as climate change mitigation measure.
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After
The number of participants planned for the experiment is 824 people completing the study. We advertise for a minimum of 900 participants to take into account individuals excluded due to the restrictions mentioned in the analysis plan.
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Field
Planned Number of Observations
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Before
The number of participants planned for the experiment is 824 people completing the study. We advertise for a minimum of 900 participants to take into account individuals excluded due to the restrictions above
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After
The number of participants planned for the experiment is 824 people completing the study. We advertise for a minimum of 900 participants to take into account individuals excluded due to the restrictions in the analysis plan.
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Field
Sample size (or number of clusters) by treatment arms
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Before
About 450 participants per treatment (about 412 participants per treatment after excluding participants as described above)
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After
About 450 participants per treatment (about 412 participants per treatment after excluding participants as described in the analysis plan)
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Field
Secondary Outcomes (End Points)
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Before
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After
Pro-environmental behavioral intentions using a self-report Likert-type scale.
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Field
Building on Existing Work
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Before
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After
No
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