A climate dilemma in the Arctic circle ! Located in the Svalbard archipelago, Longyearbyen is the northernmost city in the world. Here we extract coal for one hundred years as an energetic and economic source, which stirs many environmental paradoxes. In 2015, the mayor election year, the coal prices fall and the issue of sustainable development starts to emerge in the minds. For scientists, politicians and city locals, Longyearbyen is now facing a race against the clock.