Renewable energy is energy derived from natural sources that is replenished at a faster rate than it is consumed. The basic principle of the use of renewable energy is to extract it from processes constantly occurring in the environment and provide it for technical use. Renewable energy is derived from natural resources - such as sunlight, wind, rain, tides and geothermal heat - that are replenished naturally. Renewable energy production creates far fewer emissions than burning fossil fuels. The transition from fossil fuels, the main source of emissions, to renewable energy sources is key to overcoming the climate crisis.