Answer:
oil produces CO2
coal produces CO2
uranium does not produce CO2 aka nuclear reactors as this process requires dipping the uranium rods into water creating steam and turning a turbine making energy
natural gas does create CO2 but less than coal and oil that is why natural gas is preferred as a energy source
Explanation:
I'm not one hundred percent sure but I think that they were facilitated by rivers.
Sorry I don’t speak Spanish