Poland again will host the UN Climate Change Conference. It seems that we are in the same point as five years ago in Poznań, with a global climate agreement far from conclusion. Climate change talks have been difficult, but the results of the previous climate summits on some important issues should not be underestimated. They can help implement a post-2020 climate agreement, if one is concluded in 2015. COP19 should prepare an effective working plan of negotiations for the next two years, but it is hard to predict from the Warsaw conference whether there will be any breakthroughs in key areas of the planned climate deal.