Which of the following is a rich source of energy but never causes atmospheric pollution?

Solar energy is a rich source of energy but never causes atmospheric pollution.
Solar energy is radiant light and heat from the Sun that is harnessed using a range of technologies such as solar power to generate electricity, solar thermal energy, and solar architecture.
It is an essential source of renewable energy. It will increase countries' energy security through reliance on an indigenous, inexhaustible, and mostly import-independent resource, enhance sustainability, reduce pollution, lower the costs of mitigating global warming.