Sometimes, even renewable energy sources can have an impact on the . They also have other draw-backs:

- Hydroelectic power needs a dam to be built and a valley to be .
- Solar cells don't work well if it's .
- Biogas can cause smells or even disease.
- Tidal power stations are very expensive and can destroy wildlife .
- Wind turbines are not popular with people who live nearby. They can be noisy. If there is no , they are useless. Also they shut down if the wind is too .
- Wave power has potential, but has not been fully developed.
- Geothermal power could release gases and [?] from the rocks underneath.