The dramatic decline in vulture populations in India over the past few decades has led to severe public health consequences. A recent study suggests that half a million humans may have died prematurely between 2000 and 2005 due to this ecological crisis. The absence of these critical scavengers underscores the delicate balance between biodiversity and human health.
The study, published in the American Economic Review, estimates the monetary damage from the resulting public health crisis at nearly $70 billion annually. These findings highlight the significant benefits of conserving keystone species like vultures.
Vultures play a crucial role in India’s ecosystems by consuming disease-ridden carcasses and controlling populations of other scavengers, such as feral dogs, which can transmit rabies. Additionally, without vultures, farmers often dispose of dead livestock in waterways, exacerbating the spread of disease.
The decline began in 1994 when farmers started administering diclofenac, a drug for pain and inflammation, to cattle and other livestock. This drug proved fatal to vultures, destroying their kidneys when they fed on treated carcasses. Consequently, India’s vulture population plummeted from 50 million to just a few thousand in a decade.
Anant Sudarshan, Associate Professor at the University of Warwick and Senior Fellow at EPIC, witnessed the environmental degradation firsthand during his youth in India. He observed cattle carcasses accumulating near tanneries, leading to toxic waste contaminating waterways.
To assess the human health impacts, Sudarshan and co-author Eyal Frank, an environmental economist at the University of Chicago, overlaid maps of vulture habitats with administrative districts. They analyzed health records from over 600 districts, considering factors like water quality and healthcare access.
Their research reveals the vital role vultures play in maintaining ecological and public health. The decline of these birds has disrupted the natural disposal of carcasses, leading to increased disease transmission among humans and other animals. This study underscores the importance of preserving keystone species to protect both biodiversity and human health.
