Since last week, representatives from 195 countries have gathered in Paris to negotiate a deal to reduce carbon emissions and minimize the impact of global warming at the 21st Conference of Parties summit, or "COP21".
The World Meteorological Organization said in November 2015 is going to be the hottest year on record. Next year could be hotter still due to the El Nino weather patterns.
The underlying cause of warmer temperatures is the high percentage of carbon dioxide (CO2) emissions into the atmosphere, brought by excessive burning of fossil fuels, according to the U.S. Environmental Protection Agency.
Fossil fuels are derived from the fossils of once living organisms and include coal, oil, and natural gas - which are major sources of energy.
China and the United States account for almost half of the world's CO2 emissions.