Hidroelektrik yenilenebilir bir kaynaktır ama petrol, kömür ve doğal gaz değil.
- Hydropower is a renewable resource, but oil, coal and natural gas are not.
Kömür, doğal gaz ve petrol, milyonlarca yıl önce yaşamış bitki ve hayvanların kalıntılarıdır.
- Coal, natural gas and oil are the remains of plants and animals that lived millions of years ago.
Natural-gas prices.
... the American people believe that. I will fight for oil, coal and natural gas. And the proof, ...
... billion dollars in new factories that use natural gas ...