China’s solar expansion policy is linked to bird diversity loss, Science study finds
A Science study of 2,344 Chinese counties from 2014 to 2023 links policy-driven solar expansion to a 2 per cent fall in a standard bird diversity index.
Photo by Erik Karits on Pexels
Policies that accelerated photovoltaic build-out in China are associated with measurable declines in local bird diversity, according to a study published in Science on 20 August 2026. The paper, “China’s solar expansion policy reduces bird diversity”, analyses a panel dataset covering 2,344 Chinese counties from 2014 to 2023 and attributes the effect to land conversion rather than to the panels themselves. It is the first national-scale attempt to connect solar policy strength to a biodiversity outcome.
The lead author is Huiming Zhang of the School of Business and the Institute of Climate Economy and Low-Carbon Industry at Nanjing University of Information Science and Technology. Eight co-authors are listed, including Shanjun Li of Stanford University, Yueming (Lucy) Qiu of the University of Maryland, Shouyang Wang of the University of Chinese Academy of Sciences and Thi Thuc Anh Phan of VinUniversity in Hanoi. This is an economics and policy paper, not a field ecology study, and it appears in Science volume 393, issue 6813, pages 831 to 836.
Zhang told AFP the finding is not an argument against renewables. “The main message is not to slow the renewable energy transition, but to make solar development more ecologically informed,” he said.
What the solar expansion bird diversity analysis measured
Solar siting in China is shaped by Five-Year Plans that push development toward particular regions, which gives researchers variation in policy strength across counties that is not driven by local bird conditions. The authors used that variation as their identification strategy, controlling for national trends, weather, socioeconomic conditions, land cover and birdwatching effort, and paired it with citizen-science birdwatching records.
| Element | Detail |
|---|---|
| Sample | 2,344 counties in China |
| Period | 2014 to 2023 |
| Policy measure | Index of solar policy strength running from 0 to 15.5 |
| Headline effect | A four-point rise in policy strength linked to a 2 per cent fall in the Shannon diversity index |
| Mechanism | Cropland and grassland converted to developed land, reducing vegetation diversity |
| Groups most affected | Wealthier regions, non-desert regions, widespread species |
| Groups unaffected | Mountain-habitat species |
Sources: publisher abstract, Science 393(6813), 831-836. The 0 to 15.5 index range and the 2 per cent Shannon figure are as reported by AFP; the full paper is paywalled.
The Shannon index is a standard measure of species variety that combines how many species are present with how evenly individuals are spread among them. In her accompanying Science Perspective, “Beyond carbon in renewable energy policy”, Yuanning Liang of Peking University told AFP that “birds serve as an effective indicator group for large-scale biodiversity assessment”, because they are one of the few animal groups with abundance data available consistently across space and time.
The most counterintuitive result concerns vegetation. Leaf area index went up around solar developments, not down. Compensatory planting made the landscape leafier while making it ecologically more uniform. The authors call this “inferior greening”: diverse natural landscapes replaced by dense but homogeneous vegetation that supports fewer species.
Ken Rosenberg, a conservation scientist at Cornell University who was not involved in the research, told Scientific American the result points to a policy blind spot. “You don’t want to trade one crisis for another,” he said. He also cautioned that diversity indices can mask what is happening to individual populations, and suggested future work look at bird numbers rather than variety alone. Rosenberg said this was the first analysis he had seen linking solar policy and biodiversity at national scale.
The authors reach the same policy conclusion from the other direction. Their abstract argues that future photovoltaic development “should be accompanied by strict biodiversity safeguards, especially in economically developed regions with high habitat complexity”. Speaking to Scientific American, Zhang framed it as a siting problem: steer large projects toward locations with lower ecological conflict, assess each site, and build safeguards in from the start.
The scale the finding applies to
The study window closes in 2023, and China has built far more since. National Energy Administration data released on 28 January 2026 and reported by pv magazine show China added 315.07 GW of solar in 2025 alone, an annual record, taking cumulative installed solar to 1.20 TW at the end of December, up 35.4 per cent year on year.
AFP reported China’s solar footprint at an estimated 4,520 square kilometres by 2024, roughly the area of Rhode Island, with solar projected to make up 45 per cent of the country’s energy mix by 2060. AFP did not attribute either figure to a named source. Global context is comparable: Winss Solutions has reported that renewable energy capacity hit 5,149 GW in 2025 and that solar and storage installations set new records in the first half of 2026.
Liang’s Perspective generalises the lesson beyond photovoltaics. Its standfirst reads: “China’s policy-driven solar expansion shows why climate policy appraisal should look at biodiversity impacts”. AFP reported that she considers the siting problem relevant to renewable infrastructure more broadly, including wind.
Background: siting solar without spending habitat
The tension the paper describes is not new, and several design responses are already in commercial use. Agrivoltaics keeps land in production under or between panel rows: a Winss report on agrivoltaics powering AI data centres on comparatively little land set out the land-efficiency case, and an agrivoltaic insect net house that lifted land use 2.5 times showed the same principle applied to horticulture. Hybrid projects that stack generation and storage on one footprint, such as China’s giant solar-hydrogen-storage plant, address the same constraint from the supply side.
What the Science paper adds is a measured national estimate rather than a site-level one, and a specific warning about where the cost falls: wealthier, non-desert counties with more complex habitat, and species that are widespread rather than rare. The paper was funded by China’s National Office for Philosophy and Social Sciences under award ZD188. Its policy recommendation is narrow and testable: keep building solar, but assess sites for habitat value and write biodiversity safeguards into the approvals process.
Sources: Science; Science; Scientific American; AFP via Asharq Al-Awsat; South China Morning Post; pv magazine
Featured image: photo by Erik Karits on Pexels (free Pexels license).
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I specialize in sustainability education, curriculum co-creation, and early-stage project strategy. At WINSS, I craft articles on sustainability, transformative AI, and related topics. When I’m not writing, you’ll find me chasing the perfect sushi roll, exploring cities around the globe, or unwinding with my dog Puffy — the world’s most loyal sidekick.
