Sun, the main source of energy

Has anyone ever thought of a day without sunshine? when we say the word 'day' the image created in our mind is that of the sun. life on earth is possible because of the presence of the sun, if there is no sun then all the planets of our solar system will freeze. sun not only causes day but it holds the planets to move around its path.
Nowadays many non- renewable sources of energy like - fossil fuels, etc are used but sun is a renewable source of energy. It can be used to cook food through solar cookers, used to generate electricity etc
we should make minimum Use of non reneawble sources of energy and should Use solar energy because it is environment friendly.
I thank you for giving me this opprtunity to say a few little words about 'sun- the ultimate source of energy'
Thanks for answering me but it be enlarged