What happens to the sun's energy as it travels through earth's atmosphere

Sun's energy reaches earth, it is intercepted first by the atmosphere.

As it travels through the Earth's atmosphere a small part of the sun's energy is directly absorbed, particularly by certain gases such as ozone and water vapor,some of the sun's energy is reflected back to space by clouds and the earth's surface.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.