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 ve doğal gaz doğal yakıtlardır.
- Coal and natural gas are natural fuels.
Natural-gas prices.
... to the highest levels in 16 years. Natural gas production is the highest it's ...
... policies. Mr. President, all of the increase in natural gas and oil has happened on private ...