Uses of the sun?

Kaira raised her hand as she answered. 'Sunlight is a renewable form of energy and is used for generating electricity as it is non polluting and does not get exhausted.It can be used to treat water to remove contamination. We use it to grow crops and for basic survival cos it is the ultimate source of hear that powrrs the planet and without sun we would not have light. Or progress. Life, altogether,' she said.