Environmental pollution — from filthy air to contaminated water — is killing more people every year than all war and violence in the world. More than smoking, hunger or natural disasters. More than AIDS, tuberculosis and malaria combined.
One out of every six premature deaths in the world in 2015 — about 9 million — could be attributed to disease from toxic exposure, according to a major study released on 19 October in the Lancet medical journal.
The financial cost from pollution-related death, sickness and welfare is equally massive, the report says, costing some $4.6 trillion in annual losses — or about 6.2 percent of the global economy.
"There's been a lot of study of pollution, but it's never received the resources or level of attention as, say, AIDS or climate change," said epidemiologist Philip Landrigan, dean of global health at the Icahn School of Medicine at Mount Sinai, New York, and the lead author of the report.
"Pollution is a massive problem that people aren't seeing because they're looking at scattered bits of it," Landrigan said.
Areas like Sub-Saharan Africa have yet to even set up air pollution monitoring systems.
Soil pollution has received scant attention. And there are still plenty of potential toxins still being ignored, with less than half of the 5,000 new chemicals widely dispersed throughout the environment since 1950 having been tested for safety or toxicity.
He is also one of the 47 scientists, policy makers and public health experts who contributed to the 51-page report.
Asia and Africa are the regions putting the most people at risk, the study found, while India tops the list of individual countries.
Several other countries such Bangladesh, Pakistan, North Korea, South Sudan and Haiti also see nearly a fifth of their premature deaths caused by pollution.
Still, many poorer countries have yet to make pollution control a priority, experts say.
A court ban on firework sales before the Diwali festival didn't stop New Delhi residents from firing rockets and lighting crackers throughout Diwali night.
To reach its figures on the overall global pollution burden, the study's authors used methods outlined by the U.S. Environmental Protection Agency for assessing field data from soil tests, as well as with air and water pollution data from the Global Burden of Disease, an ongoing study run by institutions including the World Health Organization and the Institute for Health Metrics and Evaluation at the University of Washington.
Even the conservative estimate of 9 million pollution-related deaths is one-and-a-half times higher than the number of people killed by smoking, three times the number killed by AIDS, tuberculosis and malaria combined, more than six times the number killed in road accidents, and 15 times the number killed in war or other forms of violence, according to GBD tallies.
It is most often the world's poorest who suffer, the study found.
Environmental regulations in those countries tend to be weaker, and industries lean on outdated technologies and dirtier fuels.
In wealthier countries where overall pollution is not as rampant, it is still the poorest communities that are more often exposed, the report says.
The report cites EPA research showing that the U.S. has gained some $30 in benefits for every dollar spent on controlling air pollution since 1970, when Congress enacted the Clean Air Act, one of the world's most ambitious environmental laws.
Removing lead from gasoline has earned the U.S. economy another $6 trillion cumulatively since 1980, according to studies by the U.S. Centers for Disease Control and Prevention.
Some experts cautioned, however, that the report's economic message was murky.
Reducing the pollution quantified in the report might impact production, and so would not likely translate into gains equal to the $4.6 trillion in economic losses.
The report "highlights the social and economic justice of this issue," said Marc Jeuland, associate professor with the Sanford School of Public Policy and the Duke Global Health Institute at Duke University, who was not involved in the study.
Without more concrete evidence for how specific policies might lead to economic gains, "policy makers will often find it difficult to take action, and this report thus only goes part way in making the case for action," he said.
Jeuland also noted that, while the report counts mortality by each pollutant, there are possible overlaps — for example, someone exposed to both air pollution and water contamination — and actions to address one pollutant may not reduce mortality.
"People should be careful not to extrapolate from the U.S. numbers on net (economic) benefits, because the net effects of pollution control will not be equivalent across locations," he said.
While these types of studies yield estimates at best, they are used by many governments and economists trying to understand how societies value individual lives.
While there has never been an international declaration on pollution, the topic is gaining traction.
The World Bank in April declared that reducing pollution, in all forms, would now be a global priority. And in December, the United Nations will host its first pollution conference.
“The relationship between pollution and poverty is very clear,” said Ernesto Sanchez-Triana, lead environmental specialist at the World Bank. “And controlling pollution would help us address many other problems, from climate change to malnutrition. The linkages can't be ignored.”
(With inputs from AP)
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