Ethnic and racial diversity are extremely low among United States citizens and permanent residents who earned doctorates in earth, atmospheric and ocean sciences. Worse, there has been little to no improvement over the past four decades.
The geosciences tackle the complexities of the Earth. Geoscientists also study how we, as a society, affect — and are affected by — the planet we live on. Complex problems that influence all segments of society, such as demands on diminishing natural resources and climate change, require the ingenuity of investigators with a broad variety of backgrounds. Increased diversity has clear benefits for scientific advancement: different perspectives and life experiences spark unique questions and approaches to problem solving1. Collaborations involving a diverse group of people are more creative at tackling problems and lead to higher levels of scientific innovation2. Nevertheless, the geosciences are the least diverse of all STEM (science, technology, engineering and mathematics) fields.
We noticed the lack of ethnic and racial diversity among our peers as soon as we entered our PhD programme. The uniformity worsens from undergraduate to graduate to faculty level. The data support this perception; years of outreach have yet to make any significant strides toward increasing diversity at the PhD level. Efforts to increase diversity have primarily been focused on feeding the pipeline in schools and at the undergraduate level. Yet, at all degree levels, the geosciences remain the least diverse discipline within STEM3.
If we want to broaden the ethnic and racial range of people in the geoscience faculty, we first need PhD graduates who can fill the positions. We highlight the persistence of the geoscience doctorate diversity problem in the United States (US), on the basis of more than 40 years of publicly available demographic data for doctorates in the earth, ocean and atmospheric sciences earned by US citizens or permanent residents (Box 1)4. Whereas significant gains have been made in terms of gender balance among PhD recipients in the geosciences, there are few signs of improvement on the ethnic and racial diversity front at the doctorate level. In light of this failure to broaden the base of PhD-level researchers, the community needs to rethink current strategies aimed at diversifying our academic departments.
Race and ethnicity over time
The number of PhDs awarded in the earth sciences to US citizens and permanent residents has been relatively stable — around 350 per year since 1973 (Fig. 1a) — whereas the number of ocean and atmospheric science PhDs have risen remarkably in the latest decade. Taking all three disciplines together, about 60% more PhDs were awarded in 2016, compared to 1973.
When we combine all three subdisciplines — ocean, atmosphere and earth sciences (Box 1) — and stratify by self-reported ethnicity, it becomes clear that the vast majority of PhDs (86% over all years and 85% in 2016 alone) were awarded to students who identify as non-Hispanic White people (Fig. 1b; Table 1). Even more depressingly, over the 40 years covered by our data, the representation of students from underrepresented minorities (American Indian or Alaska Native, Black or African American, and Hispanic or Latino groups)4 has essentially been stagnant when compared with the proportion of the relevant groups in the US population (Fig. 1c).
The very low number of ‘other race or unknown’ students (Fig. 1b) suggests that the race and ethnicity questions were rarely skipped; the spike in Asian PhD recipients in the mid-to-late 1990s also appears in other fields, such as chemistry and economics, and is thus probably the result of a change in the categorization.
We are alarmed that the proportion of underrepresented minorities among PhD recipients in the geosciences has not improved in any meaningful metric over more than four decades, despite the efforts by our community to try to increase diversity, particularly in the past 20 years following the development of the National Science Foundation (NSF)’s Broader Impacts initiative5.
Gender over time
Predictably, in 1973, men vastly outnumbered women (Fig. 2, Table 1). However, the percentage of women earning PhDs has steadily climbed in all subfields; and in the ocean sciences, the number of women has even surpassed the number of men earning PhDs since 2009 (Fig. 2c). Women briefly outnumbered men in the earth sciences for one year (Fig. 2a).
In the earth sciences, where the total number of PhDs awarded has remained relatively constant over the past 40 years (Fig. 1a), the absolute number of doctorates going to men has actually decreased substantially over time from 347 male recipients of PhDs in 1973, to 212 in 2016. This trend holds only for White male students; for men of other ethnicities or races, no similar trend is observed. This is not at all unique to the earth sciences. For example, data from the Survey of Earned Doctorates4 (SED) show that over the same period, the number of doctorates going to White men in economics, psychology and physics has decreased by 50%.
The bigger picture
In 2016, only 6% of geoscience doctorates awarded to US citizens and permanent residents went to students from underrepresented minorities, a group who made up 31% of the US population that year6 (Table 1). With this number, the geosciences have the lowest proportion of doctorate recipients from underrepresented minorities among all STEM fields: in the physical sciences, the broad field which includes the geosciences, the percentage of doctorates awarded to students from underrepresented minorities amounted to 8% (regarding other broad fields, the numbers were 11% for mathematics and computer science, 11% for engineering, 14% for life sciences and 17% for psychology and social science). Averaged over all science and engineering students, 13% of doctorates went to underrepresented minorities — more than twice the percentage achieved in the geosciences, and still a very long way from an adequate representation of these groups compared to their proportion of the population6 (Table 1).
At 6% in 2016, the percentage of Asian Americans earning doctorates in the geosciences was roughly in line with their proportion in the US population; this group is therefore not considered to be underrepresented in STEM subjects by the NSF.
The change in gender balance is a bright spot in the data, although the field as a whole, and the atmospheric sciences in particular (Fig. 2b), still has room for improvement. However, between 2006 and 2016, female geoscience faculty representation has increased from 14% to 20%, so some progress is being made7. When and how these upward trends in female representation will translate into true gender balance at the faculty level remains to be seen.
By contrast, ethnic and racial diversity within the geosciences has stagnated, even at the doctorate level. Hispanics and Latinos are the only underrepresented group that shows improved representation; however, this increase (223% since 1990) is largely explained by the fact that this group has grown dramatically in size (157% since 1990) within the US population (Fig. 1c)8. Clearly, we still have a long way to go if our goal is to have a geoscience doctorate community that is representative of our wider population.
Unsurprisingly, women of colour are particularly underrepresented. Between 1973 and 2016, the numbers are bleak: only 20 Native American, 69 Black and 241 Hispanic or Latino women received PhDs in all three geoscience subdisciplines combined. They make up a mere 330, or 1.46%, of all doctorates awarded in over 40 years.
Where to from here
Many of us have been acutely aware of the lack of ethnic and racial diversity every time we walk into our departments, or into large international conferences such as the meetings of the American Geophysical Union or the Geological Society of America. There, we see very few people that look like us. Indeed, as recently as 2012, scientists from underrepresented minorities made up only 3.8% of tenured or tenure track faculty9 in the top 100 earth science departments.
The observation that there has been little or no progress over the past 40 years implies that the efforts from the 1990s onwards to increase diversity at the grade school and undergraduate levels have not translated into diversity at the PhD, let alone faculty, level. Certainly, these outreach efforts are worthwhile and have probably reached hundreds to thousands of students, but they are clearly nowhere near sufficient to shift our demographics. It is entirely possible that on their own, they will never translate into diversity at the doctorate level, which is necessary to ultimately diversify at the faculty level.
As a community, we need to think deeply and seriously about why the underrepresentation of some groups is so persistent, and what initiatives we can develop to make sure students from all backgrounds feel welcomed, excited, empowered and capable of succeeding at higher education in the geosciences. Initiatives aimed at grade school and undergraduate students address some of the underlying reasons why the geosciences may be less attractive to underrepresented groups, such as lack of exposure to the natural environment, field requirements and perceptions of job prospects.
We can think of a few actions that could specifically make geoscience doctorates more appealing to these groups. Much can be done on the department or university level, such as establishing more diversity fellowships to attract and retain graduate students. We can also take lessons from the success of other physical science disciplines that use the master’s degree as a pathway to PhD, such as transition programmes that partner minority-serving institutions with research universities through collaborative research10.
We also should think about how the current model of graduate school might not serve the specific personal interests or motivations of people from underrepresented groups. For example, research in other STEM fields finds that doctoral students of colour are more likely to be motivated by altruistic values and a desire to give back to their communities than their majority peers11,12,13. Perhaps encouraging or even rewarding graduate students who want to devote time to community outreach and engagement — either as a course or dissertation requirement, or as a fellowship, similar to the now-retired but successful NSF GK-12 programme14 — would go a long way to make our field relevant to more people.
Additionally, key geoscience organizations should provide specific funding for minority undergraduate and graduate students to attend their conferences, and departments and universities should provide funding for their students and faculty (regardless of race) to attend national minority-serving conferences. Increased presence at conferences such as the Society for Advancement of Chicanos/Hispanics and Native Americans in Science and the National Association of Black Geoscientists would not only serve to recruit a greater diversity of students, but promote careers and opportunities in the geosciences.
As a geoscience community, we cannot afford to miss out on the extraordinary talent that exists within currently underrepresented minority groups. We will limit the science we do if we do not become more inclusive. We need to do better.
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Bernard, R.E., Cooperdock, E.H.G. No progress on diversity in 40 years. Nature Geosci 11, 292–295 (2018). https://doi.org/10.1038/s41561-018-0116-6
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