The primary source of energy for the Earth's climate is the Sun. Solar energy drives the planet's weather systems and climate dynamics, influencing temperature, wind patterns, and precipitation. This energy reaches Earth in the form of sunlight, which warms the atmosphere, land, and oceans. The Sun's energy is essential for photosynthesis, enabling plants to convert sunlight into chemical energy, which forms the base of the food chain. Variations in solar energy due to Earth’s tilt, orbit, and solar cycles also contribute to seasonal changes and long-term climate patterns, like ice ages and warm periods.