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.
... natural gas. And the proof is our oil imports are down ...
... policies. Mr. President, all of the increase in natural gas and oil has happened on private ...