The reality of climate change and its global adverse effects are unequivocal, but, the search for an effective legal response to drive domestic interventions on climate change remains problematic. In response to effects of climate change, international law has developed at the platform of United Nations (UN). However, as is well documented, there are weaknesses in the international law system that can undermine climate protection. Considering its general relevance to the protection of the environment, there are scholarly writings suggesting that the concept of environmental constitutionalism can shape climate change interventions. Whether the concept has adequately responded to the gap under international law for climate protection, and if not, how it can evolve at the domestic level are questions that merit articulation. This contribution demonstrates that the concept of environmental constitutionalism is useful in addressing climate change challenges at the national level. Its present application, due to few challenges is not perfect, but, drawing examples from states such as Tunisia, Ecuador and Dominican Republic, the chapter demonstrates and argues the benefits in inserting a climate change clause in national constitutions, as an approach in strengthening environmental constitutionalism as a legal response to climate change at the domestic level.