What is the main source of energy for the Earth?

The main source of energy for the Earth is the Sun. Solar energy drives numerous processes on our planet, including photosynthesis in plants, which is the foundation of the food chain. It also influences the climate and weather patterns, driving ocean currents and atmospheric conditions. Additionally, solar energy is converted into other forms of energy, such as wind energy, through temperature differences in the atmosphere, and it plays a crucial role in the water cycle.

While wind, geothermal energy, and fossil fuels contribute to the Earth's energy mix, they are all derived from the energy provided by the Sun or are products of geological processes that are driven by solar energy. Thus, the Sun is fundamentally the primary source upon which other sources of energy rely.