Study Finds Destruction of Ivory Does Not Reduce Elephant Poaching Rates
The world’s elephant population has declined by half since 1979, with just about 460,000 elephants remaining — down from ten million a century ago. In an effort to curtail the death of elephants caused by ivory poaching, about 300 tons of ivory has been destroyed since 1989. Kenya organized the first public burn of stockpiled ivory in 1989, to raise awareness and deter the trade of ivory and elephant poaching, but does destroying ivory helped or hurt efforts to protect elephants?
A study led by Emma Gjerdseth, a postdoctoral researcher at the Yale School of the Environment, examined the causal effects of ivory destruction on elephant poaching rates in Africa and Asian countries. The paper, published in the journal World Development, is the first to examine the impact of ivory destruction. It found that in African countries, ivory destruction increases poaching rates with large spillover effects across the continent. In Asia, there is no evidence that elephant poaching rates respond to ivory destruction.
“The destruction of ivory is not saving elephants in the wild,” Gjerdseth said. “While poaching incentives in the country with a destruction event are unchanged because the price effect is offset by enforcement and publicity, it leads to more elephant deaths across the continent. This can create perverse incentives for countries acting on their own to participate symbolically while other countries on the continent incur negative externalities from displaced poaching activity.”
The study found that a destruction event in Africa increases poaching rates by 18% across sites.
“This research suggests that proper management of confiscated illicit materials should not involve destruction,” Gjerdseth said. “It also highlights the importance of accounting for economic incentives in wildlife conservation strategies and policies.”
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Nyeema Harris Named to National Academies Leadership Program
Nyeema Harris, the Knobloch Family Associate Professor of Wildlife and Land Conservation, has been named a member of the 2026 cohort of New Voices in Sciences, Engineering, and Medicine.
The leadership program by the National Academies of Sciences, Engineering, and Medicine aims to expand expertise in the functions of the National Academies while building a network of emerging U.S. leaders to address national and global challenges. New Voices members are competitively selected through a merit-based competition. Each cohort serves a two-year term before transitioning to alumni status.
“New Voices provides unique exposure to the National Academy of Sciences, enhancing my practical application of science diplomacy,” Harris said. "I am honored and elated by this growth opportunity and know my career trajectory will forever be changed as a result of the relationships built, data shared, and lessons learned."
Harris’ research explores carnivore behavior and movement and ecology and conservation in urban systems and national parks. She is director of the Applied Wildlife Ecology (AWE) lab at YSE.
Nyeema Harris
Knobloch Family Associate Professor of Wildlife and Land Conservation
Anthropology and Environment Program Students Earn Prizes for Research
Three YSE doctoral students — Al Lim, Botau Zhao, and Yuefei You — were recognized for their research during the American Anthropological Association in New Orleans.
Lim won the H Russell Bernard Student Paper Prize from the Society for Anthropological Sciences for his paper on how taxes and fiscal design shape subjects in AI-crypto ecosystems.
Zhao received the Nancy Abelmann Prize from the East Asia Society for best graduate student paper. The paper examines the decline of horse caravans in Yanjing, Markham, Tibet.
You earned the 2025 best student film prize from the Society for Visual Anthropology Festival of Film and Media for her documentary “What Do Ghosts Think?” The film examines how various communities in East Kalimantan respond to displacement, supernatural tales, and political censorship surrounding the construction of the new city of Nusantara.
Lim, Zhao, and You work in the lab of Michael Dove, the Margaret K. Musser Professor of Social Ecology and co-director of the Combined Doctoral Program in Anthropology.
Al Lim, Botao Zhao, and Yuefei You
Five YSE Faculty Members Named to 2025 ‘Highly Cited Researchers’ List
Five Yale School of the Environment faculty members have been named to the world’s most influential researchers list by Clarivate Analytics, a company that compiles a list of scientists and social scientists whose papers rank in the top 1% of citations.
Included on this year’s list were: Mark Bradford, the E.H. Harriman Professor of Soils and Ecosystem Ecology; Xuhui Lee the Sara Shallenberger Brown Professor of Climate Science; Anthony Leiserowitz, the JoshAni-TomKat Professor of Climate Communication; Peter Raymond, the Oastler Professor of Biogeochemistry; and Karen Seto, the Frederick C. Hixon Professor of Geography and Urbanization Science. In total, 49 faculty members from Yale University made the list of 6,868 researchers worldwide.
Mark Bradford
E.H. Harriman Professor of Soils and Ecosystem Ecology
Xuhui Lee
Sara Shallenberger Brown Professor of Climate Science
Anthony Leiserowitz
JoshAni-TomKat Professor of Climate Communication; Director of the Yale Program on Climate Change Communication (YPCCC)
Peter A. Raymond
Oastler Professor of Biogeochemistry; Co-Director, Yale Center for Natural Carbon Capture
Karen Seto
Frederick C. Hixon Professor of Geography and Urbanization Science; Director of the Hixon Center for Urban Sustainability; Co-Director of the Yale Center for Geospatial Solutions