this year's summit is to establish guidelines on how to implement the twenty fifteen paris climate accord that accord goes into effect in the year twenty twenty one of its main goals is keeping the global temperature rise to below two degrees celsius by the end of this century. over the weekend seventy nine chinese cities triggered air pollution alerts as severe winter smog covered large parts of the country. and on sunday the bosnian capital of sorry ever was the most polluted city in the world its air quality index was well over the level that triggers an emergency health warning. fighting pollution is just one of the many items on the agenda at the climate change conference in cutover itself but for many countries the price of confronting global warming is steep just the fact that poland is hosting this gathering has been slammed by environmentalists groups because of its dependence on coal the polish president dismissed the critics.