The sun plays a vital role in the life of all living things on Earth. Without it, Earth would just be a lifeless ball of rock coated with ice in some parts. It is the main source of heat and light energy for the planet and its energy provides the power for all life processes. But how is the sun's energy utilized in these processes? For instance, what is the sun's role in such a vital process as the water cycle? How does it affect human life on Earth? And are all these effects beneficial to humankind?