**4.1 Solar energy**

The radiation of the sun is used to produce solar energy. The sun is an infinite limitless source of solar energy. Solar cells convert energy from natural light into electrical energy through the process of photovoltaics. Using solar energy to generate electricity minimize the consumption of coal and fuel. Using solar energy results in a significand reduction in air and environmental pollution. Solar energy farms are presented in **Figure 1**.

Advantage of Green Solar Energy


*Introductory Chapter: Green Computing Technologies and Industry in 2021 DOI: http://dx.doi.org/10.5772/intechopen.96847*


Disadvantage of Solar Energy


#### **4.2 Wind energy**

Global efforts to combat climate change, such as the Paris Agreement, renewable energy is seeing a continues growth. Cumulative wind capacity around the world

increased from around 20,000 megawatts to more than 500,000 megawatts in the last fifteen years. Wind power is a popular sustainable, renewable source of power that has a small impact on the environment compared to burning coal or fuel. Wind energy uses the wind to provide mechanical power through wind turbines to turn electric generators for electrical power. The wind kinetic energy is used to operate electric turbines and windmills. The turbine's blades spin clockwise when the wind blows, capturing energy. When the wind blows the main shaft of the wind turbine, connected to a gearbox within the nacelle, is triggered to spin. The gearbox sends the wind energy by the gearbox to the generator. The wind energy is converted to electricity. However, windmills cannot be operated in a residential area. Offshore wind turbines provide steady, reliable clean energy in several countries. **Figure 2** presents wind energy cites. Wind is a clean source of renewable energy that produces no air or water pollution. Wind energy disadvantages include complaints from locals that wind turbines are ugly and noisy. The turbines rotating blades kill birds and bats.
