John Mahama has warned that the African country’s oil reserves could be useless if not tapped before the world shifts to clean energy Ghanaian President John Mahama has urged investors to ramp up oil production in the West African country like “there’s no tomorrow,” as delays in drilling could leave valuable resources untapped amid a global transition to renewable energy. The call comes as Ghana faces a steady decline in crude output. “Everybody who has any assets should be pumping like there’s