COP25, the international conference about climate change organized by the United Nations, is currently being held in Madrid with the assistance of 197 countries. After the signing of the Paris agreement at COP21 four years ago, this event will involve an update of the action plan designed then: to maintain the temperature increase below 1.5 degrees, to achieve the neutral carbon footprint by 2050, greater transparency and ambition of countries in terms of the commitments they make about climate change, and to favour climate finance with a sort of Green Climate Fund among others.