The subject of the study are formal and legal challenges posed by migration caused by climate change. The main reason for consideration is the growing phenomenon of resettlement induced by this process, with the simultaneous lack of regulations protecting incomers. The authors present the current state of protection of climate migrants, initiatives to provide such protection, and the example of New Zealand, which has made an attempt to look for solutions safeguarding climate migrants. The recommendation of the authors of the article clearly points to the need to adopt a definition of a climate migrant in international law.