A lot of dirt

 

"The Exxon discoveries of nine billion barrels of oil will generate about 3.87 gigatons of carbon emissions." [1]

1 Gigatonne or metric gigaton (unit of mass) is equal to 1,000,000,000 metric tons.

1. Businesses Brace for More Climate Cases
Faucon, Benoit; McFarlane, Sarah; Kusisto, Laura. Wall Street Journal, Eastern edition; New York, N.Y. [New York, N.Y]07 June 2021: B.1.