The inclusion of the fight against climate change as a target of sustainability determines the need to adopt forceful measures to reduce the effects of climate change. The current situation allows us to see that in the near future its effects will be devastating and irreversible unless drastic measures are adopted imminently. This paper aims to evaluate the legal measures taken through Spanish law, framed in the legal context of the European Union, to assess their real effectiveness. The methods of the research are the scientific methodology of legal disciplines, mainly regulatory analysis and other legal instruments, as well as case law. The results obtained show that some specific actions have been adopted through formal and informal current regulations, but much more could still be done to enforce more drastic measures in the fight against climate change. In this sense, this paper makes some recommendations to improve the effectiveness of the measures taken with this purpose.