All life on Earth depends on energy from the sun. Solar energy is the source of energy for photosynthesis. It provides the warmth necessary for plants and animals to survive. The heat from the sun causes water on the Earth's surface to evaporate and form clouds that eventually provide fresh rainwater.
Nevertheless, in the 20th century, the sun's energy has become an increasingly attractive source for small amounts of needs. A number of devices for collecting solar energy and converting it into electricity have been developed, and solar energy is used in a variety of ways. …
