The global Climate Conference was organized in Paris in 2015, when various measures to protect climate were discussed and some steps were initiated with specific target and time frame. However, decisions taken during the Paris Climate Conference are not being implemented at the desired pace, due to the conflict of interests between different countries, particularly about the production and use level of fossil fuel. With the decision of USA to withdraw from the agreement signed during the Paris Climate Conference, it appears that the decisions of the Paris Climate Conference have lost their sheen, since US is the largest economy in the world and also the large emitter of carbon dioxide. This book discusses the complex issues relating to climate challenges in a holistic manner, with focus on causes for climate crisis and mitigation steps initiated, slow pace in implementation of recommendations of Paris Climate Conference due to conflict of interests, between countries, inevitability of ecological issues due to inevitability of industrial and economic growth, global population outlook, increasing demand for energy, the fact that renewable energy sources are not entirely eco friendly, need to steadily decrease the global population to curb demand. Finally, the book urges the UNO to recognize the inadequacies of the decisions taken during the Paris Climate Conference and convene another world conference to discuss the climate issues with focus on reducing global population growth and density of population, which is the ultimate way to solve the impending global climate crisis once for all.