estimated to be around 50,000. Why: the break up of the former USSR led to uncontrolled hunting. Increased rural poverty means the species is hunted for its meat Animals in decline Swordfish (Xiphias gladius) Where: found worldwide in tropical, subtropical and temperate seas. Why: at risk from overfishing and as a target in recreational fishing. A significant number of swordfish are also caught by illegal driftnet fisheries in the Mediterranean Animals in decline Argali Sheep (Ovis mammon) Where: Central and Southern Asian mountains,usually at 3,000-5,000 metres altitude. Why: domesticated herds of sheep competing for grazing grounds. Over-hunting and poaching. Animals in decline Humphead Wrasse (Cheilinus undulatus) Where: the Indo-Pacific, from the Red Sea to South Africa and to the Tuamoto Islands (Polynesia), north to the Ryukyu Islands (south-westworld for air pollution deaths Ukraine A radioactive sign hangs on barbed wire outside a café in Pripyat. The worst countries in the world for air pollution deaths Bulgaria Mandatory Credit: Photo by NUKARI/REX (407890f) A power plant outside Sofia STOCK OF BULGARIA - FEB 2003 Rex Features The worst countries in the world for air pollution deaths Belarus The worst countries in the world for air pollution deaths Russia The worst countries in the world for air pollution deaths Armenia The worst countries in the world for air pollution deaths Bosnia and Herzegovina Women wearing masks walk in front of academy of fine arts as smog blankets Sarajevo, Bosnia and Herzegovina December 23, 2015. With severe air pollution affecting the city nestled among the mountains, the authorities