Renewable energy comes from resources that are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat. Unlike fossil fuels, renewable energy sources are sustainable and have lower environmental impacts. Common types include solar power, wind power, hydroelectric energy, and biomass. Increasing the use of renewable energy is crucial for reducing greenhouse gas emissions and combating climate change. It also promotes energy security and economic development.