The Paris Agreement adopted at the COP21 may be considered as a necessary, but insufficient starting point for the consolidation of a climate policy on a global scale capable of avoiding the collapse associated with global warming of over 2°C in the average temperature of the planet with respect to pre-industrial levels. We are now in possession of the diagnosis and technologies necessary to advance in a far more decisive way than in the past. However, there is a clear lack of sufficient political will among the vast majority of national governments and even the European Union. The implementation of suitable measures for both mitigation and adaptation to climate change will only be possible if there is extensive social mobilization, particularly in cities which generate over 70[%] of greenhouse gas emissions. Experts are warning us that the time for action is running out in view of the acceleration of adverse effects and that the heating of the oceans is playing a far more relevant role that was envisaged just a few years ago.