Green energy refers to renewable energy sources like solar, wind, hydro and geothermal that produce less environmental pollution than traditional fossil fuels. The development of green energy technologies will help reduce climate change impacts, improve air quality, and lessen dependence on fossil fuels. Solar power in particular is a major source of green energy, providing at least 50% of renewable energy. While the costs of green energy production may be higher currently, improved technologies and efficiency are expected to offset expenses over time.