On the “Fossil Free Indexes: The Carbon Underground 2015” website, it states:

“The Carbon Underground 200 identifies the top 100 public coal companies globally and the top 100 public oil and gas companies globally, ranked by the potential carbon emissions content of their reported reserves. The reserves of these companies total 555 gigatons (Gt) of potential CO₂ emissions, almost five times more than can be burned for the world to have an 80% chance of limiting global temperature rise to 2°C (3.6° F).”

Find ‘The Carbon Underground 200’ here under the tab ‘Rankings’:

http://fossilfreeindexes.com/research/the-carbon-underground/