The USGS said it did not consider economic factors, such as the effects of permanent sea ice or water depths, in its assessment of undiscovered oil and gas resources.
Wages have not kept pace with inflation. Taking into account higher prices paid for food, healthcare, housing and a range of other necessary expenditures, wages are equal to those paid 40 years ago.
The billionaires intend to use the money to help governments in developing countries implement policies and increase funding that could help reduce tobacco use.