Over 80 percent of all electricity produced by renewable sources is produced by large hydroelectric dams. With low carbon dioxide emissions and operating costs, hydropower is an important part of a climate-friendly energy mix.

However, mega projects with devastating impacts on the environment, like the Three Gorges Dam in China, have tainted the image of hydropower. More sustainable sources, such as wave and tidal power, could save the reputation of water-based energy production.

Worldwide Importance and Future Trends
Hydropower accounts for around 16 percent of the world's electricity generation, and a little over 3 percent of the world's total energy supply.

Facts on Geothermal Energy

There are many different types of energy available to power our world. For years, people have used the power of burning fossil fuels, such as coal (also used to produce steam power) to create energy. In recent times, there has been a shift to using renewable resources to create the energy we need. These resources include hydroelectric power, solar power, wind power, biomass energy and geothermal energy. While many people know about the first four of these resources, geothermal energy is less well-known. Here are some facts on geothermal energy so that you can get to know this energy source better,,,