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 ... 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. The report marks the first attempt to pull together data on disease and death caused by all forms of pollution combined. "Pollution is a massive problem that people aren't seeing because they're looking at scattered bits of it," [lead study author Philip] Landrigan said. Experts say the 9 million premature deaths the study found was just a partial estimate, and the number of people killed by pollution is undoubtedly higher. 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. The vast majority of pollution-related deaths ... occur in low- or middle-income developing countries, where policy makers are chiefly concerned with developing their economies. In wealthier countries where overall pollution is not as rampant, it is still the poorest communities that are more often exposed, the report says.