What is the main source of energy that drives the earth's systems?

Main source of energy that drives the earth's systems is Sun.

Explanation:

The Sun drives all the Earth's systems and makes life possible on this planet with a tremendous amount of energy that it releases. Apart from warming the Earth, the Sun also maintains the hydrologic cycle.

The sunlight reaching the earth is absorbed by the land surfaces, all the water bodies, and atmosphere while at the same time, some of the energy is reflected by the ice and the clouds into space.

When the Earth emits the same amount of energy that the Sun does, a balance is maintained in the average temperature of the planet. The Earth's climate is determined by the amount of sunlight that is received from the Sun and changes in the latter will cause a significant difference in the climate and weather; depending on this factor, the earth will either be warm or cool.

i believe that if you say you can, you cant and if you say you can't your right. i believe i can do anything i set my mind to. i've applied this with my everyday life. it me get motivated to do stuff.for example, i apply this to do school. if i believe i can finish a whole class in a couple of week's i will be motivated to do the class until i finish it, and if i believe i can't, i will get distracted and do other stuff besides doing my work. it changed me by believing i can accomplish anything i set my mind to.