silent as obama destroyed the country. as the world's number one killer environmental pollution is causing more deaths every year than wars and violence natural disasters hunger or smoking now a major study published in the lancet medical journal says that one out of every six premature deaths in twenty fifteen that's about nine million can be attributed to diseases caused by toxic exposure low and middle income countries are worst affected here pollution can be responsible for up to a quarter of all deaths but developed countries are also grappling with the effects of dirty air and contaminated water ships in hamburg's harbor pumping air chemicals they're the main source of air pollution in this northern german port city but hamburg's air is holes to full of dust particles nitrogen oxide and c o two emitted by the city's cars and power stations air pollution is