Climate change is one of the most serious problems humanity has ever faced. Rising temperatures along with the sea, extinction of entire species of plants and animals, fundamental for the balance of the Earth's ecosystem and the always most frequent succession of unpredictable extreme natural events are just some of the manifestations of this transition. For decades, the most influential international organizations have involved world powers in large-scale agreements to try to mitigate and limit these tragic consequences that by now influence our daily life. In doing so the United Nations has played a fundamental and pioneering role. UNFCCC, Kyoto Protocol and Paris Agreement are the most important international treaties and conventions defined to fight climate change.