1. Alternative sources of energy Eliška Dlouhá V8A

2. Alternative sources of energy reduce our dependance on fossil fuels renewable environmental friendly no pollution

3. Solar energy ineffective - only 30% passive - duration, position, sun’s rays intensity active - electrical technology - solar panels no pollution, no care ineffective in colder regions

4. Wind energy windmill family energy needs, industrial uses (wind farms) no air pollution low cost windy areas noisy kill birds

5. Hydroelectric energy largest producer dams, water mills constant, predictable, controllable no greenhouse gases huge costs to build prevent the migration of fish tidal power

6. Geothermal energy from beneath the earth magma → heat → boil water → steam → turns the turbines no pollution, effective suitable for particular region harmful gases huge installation cost

7. Summary solar energy wind energy hydroelectric energy geothermal energy biomass energy hydrogen every source suitable for different area

8. Sources http://www.conserve-energy-future.com/AlternativeEnergySources.php, 23. 2. 2015 http://www.conserve-energy-future.com/AlternativeEnergySources.php http://www.altenergy.org/, 23. 2. 2015 http://www.altenergy.org/ http://en.wikipedia.org/wiki/Renewable_energy, 23. 2. 2015 http://en.wikipedia.org/wiki/Renewable_energy http://saveenergy.about.com/od/alternativeenergysources/a/altenergysource.htm, 23. 2. 2015 http://saveenergy.about.com/od/alternativeenergysources/a/altenergysource.htm