Poland: hero or villain on climate change? That will be the question for thousands of delegates at a series of crunch meetings on global warming in the next two weeks.

While many of the Polish government’s climate change experts will be in the western Polish city of Poznan, hosting the governments of more than 190 countries at UN talks on global warming, their colleagues will be hundreds of miles away in Brussels arguing for a serious weakening of the European Union’s climate change targets.