Chart tracks emissions year to year since 1950 for the current Top 5, Top 10 and Top 20 emitting companies. Almost all are oil companies.
Top 20 investor- and state-owned emitters, starting with the largest: Saudi Aramco, Chevron, Gazprom, ExxonMobil, National Iranian Oil, BP, Royal Dutch Shell, Coal India, Pemex, Petroleos de Venezuela, PetroChina, Peabody Energy, ConocoPhillips, Abu Dhabi, Kuwait Petroleum, Iraq National Oil, Total SA, Sonatrach, BHP Billiton and Petrobras. Gazprom emissions count begins in 1989.