1. COP stands for Conference of the Parties. It refers to the countries that have signed the 1992 United Nations Framework Convention on Climate Change (UNFCCC). The COP in Paris is the 21st such conference.
3. The leaders will gather in a huge conference centre at the Le Bourget airfield near the spot where Charles Lindbergh landed his plane, Spirit of St. Louis, in 1927, after making the first solo trans-Atlantic flight, a feat that helped bring nations closer.
4. Number of days the talks will be on: November 30-December 11.
Number of countries: 196 (195 countries plus the European Union)
5. A binding agreement by countries to implement emission cut pledges declared earlier is expected. As many as 177 countries/blocs including India, China, the US and the EU have declared these planned cuts. They account for 93% of current global carbon emissions.
The agreement will come into effect in 2020.
6. No 'Planet B'
With the global attention on how rich nations and the biggest carbon emitters would place themselves to save the earth, UN secretary general Ban Ki-moon has said that that there is no "Plan B" for action as there is no "Planet B."
7. 2 degrees C is the threshold at which the worst impacts of global warming will be inevitable. But scientists say that this is no longer attainable with the pledges so far. Temperatures will rise by 2.7 to 3.6 degrees C by 2100.
8. China is the world's top emitter, with 10,260 MT CO2, followed by the US and India. Australia is the largest emitter per capita.
9. While China has committed to start reducing total emissions by 2030, India has undertaken a more modest 30-35% cut.New Delhi would be put under pressure to commit more, particularly on curbing its coal use.
India argues for 'climate justice' and says that the advanced countries who are mainly responsible for global warming, must take a lion's share of the cuts and give funds to others to access green technology.
10. By 2030, India will reduce emissions intensity by at least 33 per cent of 2005 levels. At least 40 per cent of the installed power capacity will be from non-fossil fuel sources.
India will have 175GW of renewables by 2022 and will have imposed levies on coal and rationalised subsidies on petroleum products.