Green energy comes from natural sources such as sunlight, wind, rain, tides, plants, algae and geothermal heat.
Types of green energy
Solar Power – The most prevalent type of renewable energy, solar power is typically produced using photovoltaic cells, which capture sunlight and turn it into electricity. Solar energy is also used to heat buildings and water, provide natural lighting and cook food. Solar technologies have become inexpensive enough to power everything from small hand-held gadgets to entire neighborhoods.
Wind Power – Air flow on the earth’s surface can be used to push turbines, with stronger winds producing more energy. High-altitude sites and areas just offshore tend to provide the best conditions for capturing the strongest winds.
Hydro-power – Also called hydroelectric power, hydro power is generated by the Earth’s water cycle, including evaporation, rainfall, tides and the force of water running through a dam.
Geothermal Energy – Just under the earth’s crust are massive amounts of thermal energy, which originates from both the original formation of the planet and the radioactive decay of minerals. Geothermal energy in the form of hot springs has been used by humans for millennia for bathing, and now it’s being used to generate electricity.
Biomass – Recently-living natural materials like wood waste, sawdust and combustible agricultural wastes can be converted into energy with far fewer greenhouse gas emissions than petroleum-based fuel sources.
Bio-fuels – Rather than burning biomass to produce energy, sometimes these renewable organic materials are transformed into fuel. Notable examples include ethanol and bio-diesel.