We have started from the very basics, by explaining various key concepts like Green House Effect and the related gases. We have built up the momentum by explaining various anthropocentric activities and natural factors that impact the global temperatures. We have lucidly dealt with IPCC its relevance and the importance of various protocols like Kyoto. We have also explained the outcomes of various international summits and conferences. Finally we have concluded the section with the Paris Agreement, its relevance and its future with the unilateral walk-out of US and Katowice Summit.