Climate change inevitably will precipitate climate-related migration on a global scale. Although this influx often is projected as a future phenomenon, there already is compelling evidence of both internal and international migration. Current migration patterns can be attributed to variations in temperature, rainfall, and flooding, particularly in agricultural regions (Backhaus, Martinez-Zarzoso, and Muris Reference Backhaus, Martinez-Zarzoso and Muris2015; Coniglio and Pesce Reference Coniglio and Pesce2015). The impact of climate change on agriculture is widely accepted as the primary driver of climate-related migration (Cai et al. Reference Cai, Feng, Oppenheimer and Pytlikova2016; Feng, Krueger, and Oppenheimer Reference Feng, Krueger and Oppenheimer2010). The United Nations estimates that “3.3–3.6 billion people are highly vulnerable to climate change” (Intergovernmental Panel on Climate Change 2023, 17).

Climate change already is causing large-scale movements of people, as demonstrated in the August 2022 Pakistani floods that affected 33 million people and left homeless millions of Pakistanis and almost half of Afghan refugees.Footnote ¹ This type of devastation, as well as more slow-moving but equally devastating loss of agricultural capacity, will compel hundreds of millions of people to leave their homes—especially in the Global South—and seek shelter and sustenance elsewhere, including in the Global North. In the United States, the Center for Migration Studies predicts significant climate-related migration during the next three decades,Footnote ² and one model predicts an influx of more than 30 million climate-related migrants over 30 years from Central America alone (Lustgarten Reference Lustgarten2020). Thus, the question of how the United States treats climate-related migration is of urgent concern.

However, US immigration law is ill-adapted to respond as countries become less habitable. Climate-related migrants do not constitute a legal category, and there is no legal basis for claiming asylum for environmental reasons (Helbling Reference Helbling2020; McAdam Reference McAdam2012). Whereas some may meet the traditional refugee definition (i.e., conflict arising from climate-caused deprivation) (Mitchell and Pizzi Reference Mitchell and Pizzi2021) or through temporary protected status (TPS) (e.g., floods and storms), U.S. Presidents vary in their use of TPS. That volatility will make it problematic to use consistently for climate-related migrants.

Given the inevitable surge in climate-related migrants to the United States in the near future and the current inability to receive climate-related migrants in the American legal framework, this study seeks to understand whether there is a public appetite to address this gap. We evaluated three questions: (1) How sympathetic is the US public to climate-related migrants, compared to other migrants?; (2) Among which subsets of the population is support for climate-related refugees higher?; and (3) Which factors drive positive evaluations of climate-related refugees? Related to our first purpose, we formulated three hypotheses that are described in the following discussion.

Prior research on general immigration reveals negative attitudes (Adida, Lo, and Platas Reference Adida, Lo and Platas2019; Bansak, Hainmueller, and Hangartner Reference Bansak, Hainmueller and Hangartner2016; Clayton, Ferwerda, and Horiuchi Reference Clayton, Ferwerda and Horiuchi2021; Donnaloja Reference Donnaloja2022; Findor et al. Reference Findor, Hruška, Jankovská and Pobudová2021). In addition, most of the extant work on Western democracies has found more negative attitudes for climate-related refugees than for political refugees. These differences persist after controlling for factors that typically affect attitudes toward migrants (Arias and Blair Reference Arias and Blair2022; Hedegaard Reference Hedegaard2022; Stanley, Tseung-Wong, and Leviston Reference Stanley, Tseung-Wong and Leviston2022; Yates et al. Reference Yates, Manuela, Neef and Groot2022; but see also Helbling Reference Helbling2020; Henning, Steimanis, and Vollan Reference Henning, Steimanis and Vollan2022). Deservingness theory, established in the social psychological literature (Feather Reference Feather1999), posits that people are more supportive of others if they are perceived as deserving of the benefits they receive and not deserving of the losses. In this context, migration literature has shown that political refugees are viewed as undeserving victims whereas economic migrants are not viewed as so undeserving of their difficult circumstances. Climate-related refugees are perceived as intermediate to these two extremes (e.g., Arias and Blair Reference Arias and Blair2022; Verkuyten, Mepham, and Kros Reference Verkuyten, Mepham and Kros2018).

Only two studies focus on American attitudes (Arias and Blair Reference Arias and Blair2022; Stanley, Tseung-Wong, and Leviston Reference Stanley, Tseung-Wong and Leviston2022). For replication purposes, our first hypothesis tests whether we find a similar pattern in our data:

Previous research also finds that climate-related refugees are preferred to economic migrants. Research in Austria, Denmark, Germany, and the United States reveals that climate-related migrants are perceived to be more deserving than economic migrants because they are viewed as not having individual control of their circumstances. However, previous research does not distinguish between climate-related migrants forced to move because of natural disasters and those impelled by poverty (i.e., poor agricultural prospects). This differentiation is important to explore because the long-term suffering associated with degraded economic prospects is more likely to lead to migration. However, given the importance of deservingness, we expected more positive attitudes toward those impelled by natural disaster:

Our third hypothesis concerns the subgroup analyses. We expected some segments of the population to be more receptive to climate-related migrants than other segments. For example, research evaluating climate anxiety among children across 10 countries found, on average, that between 20% and 25% of respondents were “extremely worried about climate change” (Hickman et al. Reference Hickman, Marks, Pihkala, Susan Clayton, Mayall, Wray, Mellor and van Susteren2021). In the United States, some children took extreme political and legal action by filing suit against the US Federal Government for its inaction on addressing climate change in Juliana v. US, and a significant number have participated in climate school strikes (Laux Reference Laux2021; Salas, Jacobs, and Perera Reference Salas, Jacobs and Perera2019). Similarly, some researchers have highlighted partisan gaps in attitudes toward climate change and climate-change–related behavior (Tyson and Kennedy Reference Tyson and Kennedy2023). Namely, Republicans and Democrats have different expectations about the impacts of climate change on their daily life: 86% of Democrats versus 37% of Republicans expect harms from climate change to worsen in their lifetime. Because these subgroups—that is, younger individuals, those with high climate-change anxiety, those who previously engaged in climate-change–related political activities, and Democrats—tend to believe in anthropogenic climate change, and because research has shown previously that strong belief in anthropogenic climate change positively impacts attitudes toward climate-induced migrants (Yates et al. Reference Yates, Manuela, Neef and Groot2022), we expected these subgroups to be more positive toward receiving climate-related refugees:

Finally, to our knowledge, no prior study has compared expectations of climate-related refugees’ and other types of migrants’ prospects for integration. By investigating this, we make a substantial contribution because migration concerns not only accepting or dismissing individuals but also has an integration dimension. Although it is worth studying, we did not anticipate significant differences between different migration groups because we did not expect the reason for migration to relate to expectations regarding integration capacity (this hypothesis was not preregistered):

To test these hypotheses, we fielded a preregistered conjoint experiment to 1,117 US adults in September 2022 (Adman, Lajevardi, and Seligsohn Reference Adman, Lajevardi and Seligsohn2024). This design allowed us to test which specific attributes generated support for or opposition to prioritizing refugee visas, as well as to evaluate whether preferences for climate-related migrants are similar to attitudes about whether these migrants can integrate into the United States. Our design also allowed us to evaluate how these preferences vary across different American subgroups. After the experiment, respondents participated in an open-ended writing task in which they described a climate-related migrant. This allowed us to gauge how their anxiety about climate change, immigration, and economic conditions related to their evaluation of climate-related refugees.

Our results indicate that Americans welcome climate-change migrants less than political refugees and on par with economic migrants. Respondents did not believe that these migrants were less able to integrate to the United States. Our subgroup analyses also revealed that those respondents with high levels of climate anxiety, those who have previously engaged in climate-related political activities, and young Americans do not discriminate against climate-related migrants. However, our partisan hypotheses were not confirmed: relative to the baseline, Democrats and Republicans both discriminated against climate-related migrants. Finally, to further unpack the drivers of climate-related–migrant attitudes, we qualitatively coded the open-ended writing task. We found that climate anxiety is linked positively to more positive evaluations of climate-related migrants. This study sheds light on US public attitudes toward climate-related migrants, identifies the American subgroups that are most inclined to include them, and describes climate anxiety as a key and underexamined factor in shaping evaluations of climate-related migrants.

RESULTS

This section presents our main analyses and reports both aggregate and subgroup results. This section concludes with an exploratory analysis that unpacks the drivers of climate-related migrants by examining open-ended answers.

Main Aggregate Effects

The main results of our conjoint experiment are presented in figure 1. Figure 1(a) confirms our first preregistered hypothesis (Hypothesis 1) that Americans prefer issuing visas to refugees who are seeking asylum due to political persecution rather than to climate-related refugees, regardless of whether the reason for climate migration was poverty or natural disaster (ranging between 4.4 and 8.6 percentage points).

Figure 1 Effects of Refugee Characteristics on Respondents’ Probability of Visa Selection and Integration Prospects (All Respondents)

However, Hypothesis 2 is not confirmed: although there is a tendency that poverty migrants are less welcome than natural-disaster migrants, there are no statistically significant differences between any of the different poverty- and natural-disaster–related categories (regardless of whether climate change was the underlying factor to poverty/natural disasters).

The results in figure 1(a) confirm our preregistered hypotheses that Americans discriminate against Muslim refugees (8.2 percentage points) or whose religion is unknown (5.4 percentage points) over Christian refugees; prefer younger refugees (ranging from 5.3 to 12.1 percentage points); and refugees who speak English fluently (17.9 percentage points) or somewhat (8.6 percentage points) over older refugees and those who cannot speak English; choose those refugees with children (9.8 percentage points) over those without children; and discriminate against male over female refugees (7.2 percentage points). Our preregistered hypothesis about a fictional refugee’s region of origin was not confirmed. Rather, Americans prefer issuing visas to refugees from Africa more than those from Europe and prefer those from the Middle East the least; however, this result is not statistically significant. Thus, these aggregate analyses demonstrate that many of the immigrant characteristics that extant literature indicates as vitally important in shaping immigration-related attitudes continue to be perceived in this context.

Our second dependent variable examines the extent to which the randomly varied attribute levels shape respondents’ beliefs that the fictional refugees will be able to integrate successfully into American life. As shown in figure 1(b), key differences emerge from our first dependent variable. Most important, climate change as the cause of migration, for the most part, does not differentially or substantially shape respondents’ perceptions about their ability to integrate successfully (ranging from 0.4 to 3.3 percentage points and marginally significant for only one of the climate-change attribute levels). Thus, our fourth hypothesis is confirmed—that is, that climate-related refugees are considered to be able to integrate successfully in the United States to the same extent as political and economic migrants. This confirms prior research that found that Americans prefer admitting climate-change migrants less; however, we demonstrate that it is not related to beliefs about successful social integration.

Subgroup Effects

Do preferences toward refugee attributes differ across different American subgroups? To test for interactions between respondent characteristics and refugee attributes, we subsetted the main analysis by respondent age, partisanship, levels of climate anxiety, and levels of climate-related political participation. This analysis corresponds to figure 1, which is subsetted to younger Americans (N=335) between the ages of 18 and 35 and older Americans 65 and older (N=184) (figure 2); self-identified Democrats (N=489) and Republicans (N=281) (figure 3); and those respondents who were high (N=193) and low (N=466) in climate-change–related anxiety (figure 4).

Figure 2 Subgroup Differences: Age

Figure 3 Subgroup Differences: Party

Figure 4 Subgroup Differences: Climate Anxiety

Our results indicate that younger Americans do not statistically discriminate against climate-related refugees, whereas older Americans consistently rate climate-related refugees (ranging from 15.4 to 21.1 percentage points) lower than refugees applying for visas due to political persecution.

Partisanship does not serve as a deterrent to climate-related–migrant discrimination as we hypothesized. Rather, Democrats penalize climate-related migrants compared to the baseline (ranging from 6.1 to 7.1 percentage points) even more than Republicans (ranging from 0.2 to 10.9 percentage points). Finally, moderators linked meaningfully with Americans’ evaluations of climate-related migrants. Specifically, those respondents high in climate anxiety and those who previously had engaged in high levels of climate-change–related political participation did not significantly differ in their evaluation of climate-related migrants and refugees whose application was driven by risks of political persecution. Thus, Hypothesis 3 is supported for climate anxiety and participation and young individuals but not for Democrats.Footnote ⁵

Extension: Unpacking drivers of attitudes toward climate-related migrants with open-ended answers

To understand more about who Americans imagine a climate-related refugee to be, we asked survey respondents, after exposure to treatment, to respond to the following prompt: “In a few sentences below, please describe the person you imagine when you think of a refugee who is migrating to the United States because of climate change.” In this analysis, which was not preregistered, we omitted respondents who did not pass the attention check and those who provided nonsensical answers, resulting in 1,035 coherent responses.Footnote ⁶ A research assistant (RA) coded respondents’ answers for valence. We find that respondents were slightly more likely than not to offer a positive (18.74%) rather than a negative (16.23%) assessment of climate-related migrants.

Given that our findings so far support Hypothesis 3 in that climate anxiety has a moderating role in reducing discrimination against climate-related migrants, we expected strong climate anxiety to be associated with more positive evaluations of climate-related refugees. After their exposure to treatment, we asked survey respondents to indicate their anxieties about climate change, their employment, and immigration policies. Specifically, we asked, “In the past year, how much anxiety and stress have the following caused you?” We asked them to indicate their anxiety about these three issues ranging from “no anxiety and stress at all” (1) to “the most anxiety and stress” (10). Mean answers for each issue were as follows: 5.18 for climate change, 4.95 for their employment, and 4.73 for immigration policies.

Table 1 presents four ordinary least squares regressions.Footnote ⁷ In models 1 and 2, the outcome variable is the RA’s coding of “positive evaluations” of climate-related refugees; in models 3 and 4, the outcome variable is their coding of “negative evaluations” of climate-related refugees. In models 1 and 3, we controlled for only the three anxiety variables, whereas in models 2 and 4, we added controls for gender, age, partisanship, ideology, income, education, race, and immigrant status.

Table 1 Relationship Between Climate-Change Anxiety and Positive Versus Negative Evaluations of Climate Migrants

Notes: Standard errors are in parentheses. +p<0.10, *p<0.05, **p<0.01, ***p<0.001.

First, anxiety about climate change links to shaping attitudes toward climate-related refugees, regardless of the dependent variable and whether or not we included additional controls. In models 1 and 2, anxiety about climate change correlated with more positive responses when respondents were asked to evaluate climate-related refugees. In models 3 and 4, anxiety about climate change was significantly associated with respondents providing a less negative evaluation of climate-related refugees, with or without controls. Notably, anxiety about immigration or employment did not seem to link significantly to positive evaluations of climate-related refugees. However, we did find that both low anxiety about climate change and high anxiety about immigration policy significantly associated with negative evaluations (with almost equal substantive effect sizes).