What is the main source of energy over the earth and why

"The Sun is Earth's main source of energy, making the development of solar power a natural choice for an alternative energy source.  Solar radiation is the fundamental energy driving our climate system, and nearly all climatic and biologic processes on Earth are dependent on solar input. Energy from the sun is essential for many processes on Earth including warming of the surface, evaporation, photosynthesis and atmospheric circulation."

Explanation:

This is the answer.

The sun is the main source of energy over because it does alot things.

it provides sunlight for humans and animals, vitamin D at dawn.