Hydrocarbons (such as coal, petroleum, and natural gas) contain carbon as well--coal "reserves" (not "resources") amount to around 900 gigatonnes, and oil reserves around 150 gigatonnes.. 
Ó wà nínú ẹgbẹ́ 18 (àwọn ẹ̀fúùfù Aìrẹire) lórí tábìlì ìdáṣíkọ̀ àwọn Elimẹ́ńtì.. 