2. Solar energy

Every second, by transforming 700 million tonnes of hydrogen through an atomic fusion reaction, the sun produces energy equal to 386 billion billion megawatts (3.86 · 10 ²⁶ W). In the form of electromagnetic radiation, some of this energy reaches the earth's surface. Unlike other renewable energies, there are no problems with deposits: solar energy is available everywhere on our planet. Europe receives an average of 3 kWh per square meter every day. In countries where photovoltaic electricity is heavily subsidized, national programs such as "100,000 Solar Roofs" were launched in Germany in 1999. Photovoltaic modules can be installed on existing buildings or incorporated into the design of a building. In the form of tiles